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!set methtit=Rewrite an equation

!set methenv=ZZ QQ RR CC

!set methparmtype=parm equation, function, choice, function

!set methhelp=You can use this method to transform an existing equation\

 into an equivalent one, by a composition of addition of terms,\

 exchange of sides and multiplication by a non-zero constant.

!if $wims_read_parm iswordof form check

 !goto $wims_read_parm

!endif

!exit

:form

 Rewrite the equation

 !read deduc/methparm.phtml 1

 to <br>

 <input size=15 name=methparm2 value="$methparm2">

 =

 <input size=15 name=methparm4 value="$methparm4">

 !set methremark=Your new equation must be equivalent to the original one.

!exit

:check

 !distribute items $methparmobj1 into data,left1,sign1,right1

 sign2==

 sign3==

 !if $sign2 notsametext $sign1 and $sign3 notsametext $sign1

  :badequiv

  error=Your new equation is not equivalent to the original one!

  !advance penalty

  !exit

 !endif

 check1=($left1) - ($right1)

 check2=($methparm2) - ($methparm4)

 !read deduc/sub/checkzero $check1\

	$check2

 !distribute line $out into out1, out2

 !read deduc/sub/_Simplify ($check1) / ($check2)

 out3=$out

 !if $out1=yes or $out2=yes

  !if $out1!=yes or $out2!=yes

   !goto badequiv

  !endif

 !else

  out3=$[$out3]

  !if NaN isin $out3 or Inf isin $out3

   !goto badequiv

  !endif

 !endif

 methexp=Rewriting of \($left1 = $right1)

 newobject1=$methparm2 = $methparm4

 oldobject=1

!exit