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15+3x=7+4x
We move all terms to the left:
15+3x-(7+4x)=0
We add all the numbers together, and all the variables
3x-(4x+7)+15=0
We get rid of parentheses
3x-4x-7+15=0
We add all the numbers together, and all the variables
-1x+8=0
We move all terms containing x to the left, all other terms to the right
-x=-8
x=-8/-1
x=+8
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