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2(5x-2)-2(2x+7)=3
We move all terms to the left:
2(5x-2)-2(2x+7)-(3)=0
We multiply parentheses
10x-4x-4-14-3=0
We add all the numbers together, and all the variables
6x-21=0
We move all terms containing x to the left, all other terms to the right
6x=21
x=21/6
x=3+1/2
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