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7(-5x-10)=-210
We move all terms to the left:
7(-5x-10)-(-210)=0
We add all the numbers together, and all the variables
7(-5x-10)+210=0
We multiply parentheses
-35x-70+210=0
We add all the numbers together, and all the variables
-35x+140=0
We move all terms containing x to the left, all other terms to the right
-35x=-140
x=-140/-35
x=+4
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