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-7(10+x)=70
We move all terms to the left:
-7(10+x)-(70)=0
We add all the numbers together, and all the variables
-7(x+10)-70=0
We multiply parentheses
-7x-70-70=0
We add all the numbers together, and all the variables
-7x-140=0
We move all terms containing x to the left, all other terms to the right
-7x=140
x=140/-7
x=-20
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