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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