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8x+7=-6x
We move all terms to the left:
8x+7-(-6x)=0
We get rid of parentheses
8x+6x+7=0
We add all the numbers together, and all the variables
14x+7=0
We move all terms containing x to the left, all other terms to the right
14x=-7
x=-7/14
x=-1/2
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