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15+6x=7+8x
We move all terms to the left:
15+6x-(7+8x)=0
We add all the numbers together, and all the variables
6x-(8x+7)+15=0
We get rid of parentheses
6x-8x-7+15=0
We add all the numbers together, and all the variables
-2x+8=0
We move all terms containing x to the left, all other terms to the right
-2x=-8
x=-8/-2
x=+4
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