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8x+15=7-x
We move all terms to the left:
8x+15-(7-x)=0
We add all the numbers together, and all the variables
8x-(-1x+7)+15=0
We get rid of parentheses
8x+1x-7+15=0
We add all the numbers together, and all the variables
9x+8=0
We move all terms containing x to the left, all other terms to the right
9x=-8
x=-8/9
x=-8/9
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