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-10(7+x)=-220*
We move all terms to the left:
-10(7+x)-(-220*)=0
We add all the numbers together, and all the variables
-10(x+7)-0=0
We add all the numbers together, and all the variables
-10(x+7)=0
We multiply parentheses
-10x-70=0
We move all terms containing x to the left, all other terms to the right
-10x=70
x=70/-10
x=-7
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