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-7(10x+8)=644
We move all terms to the left:
-7(10x+8)-(644)=0
We multiply parentheses
-70x-56-644=0
We add all the numbers together, and all the variables
-70x-700=0
We move all terms containing x to the left, all other terms to the right
-70x=700
x=700/-70
x=-10
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