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7+2+15=3x+5x-4x
We move all terms to the left:
7+2+15-(3x+5x-4x)=0
We add all the numbers together, and all the variables
-(+4x)+7+2+15=0
We add all the numbers together, and all the variables
-(+4x)+24=0
We get rid of parentheses
-4x+24=0
We move all terms containing x to the left, all other terms to the right
-4x=-24
x=-24/-4
x=+6
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