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5(x+7)=-7x-49
We move all terms to the left:
5(x+7)-(-7x-49)=0
We multiply parentheses
5x-(-7x-49)+35=0
We get rid of parentheses
5x+7x+49+35=0
We add all the numbers together, and all the variables
12x+84=0
We move all terms containing x to the left, all other terms to the right
12x=-84
x=-84/12
x=-7
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