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3(5x+7)=-99
We move all terms to the left:
3(5x+7)-(-99)=0
We add all the numbers together, and all the variables
3(5x+7)+99=0
We multiply parentheses
15x+21+99=0
We add all the numbers together, and all the variables
15x+120=0
We move all terms containing x to the left, all other terms to the right
15x=-120
x=-120/15
x=-8
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