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-4x+2(4x-21)=-82
We move all terms to the left:
-4x+2(4x-21)-(-82)=0
We add all the numbers together, and all the variables
-4x+2(4x-21)+82=0
We multiply parentheses
-4x+8x-42+82=0
We add all the numbers together, and all the variables
4x+40=0
We move all terms containing x to the left, all other terms to the right
4x=-40
x=-40/4
x=-10
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