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konrad509
It depends. You'd need to give some example, but generally the idea is to put all variables on one side and everything else on the other side.

[tex]15 +2x =2+5x\\ 2x-5x=2-15\\ -3x=-13\\ x=\dfrac{13}{3}[/tex]
It depends on where you have it for example, p=3, m=2
 8p+5=7m+15
24+5=14=15
29=29

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