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8x+7=-7x-7
We move all terms to the left:
8x+7-(-7x-7)=0
We get rid of parentheses
8x+7x+7+7=0
We add all the numbers together, and all the variables
15x+14=0
We move all terms containing x to the left, all other terms to the right
15x=-14
x=-14/15
x=-14/15
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