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2(x-4)+7(-20)=4x
We move all terms to the left:
2(x-4)+7(-20)-(4x)=0
We add all the numbers together, and all the variables
-4x+2(x-4)-140=0
We multiply parentheses
-4x+2x-8-140=0
We add all the numbers together, and all the variables
-2x-148=0
We move all terms containing x to the left, all other terms to the right
-2x=148
x=148/-2
x=-74
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