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2x+3(2x-7)=3
We move all terms to the left:
2x+3(2x-7)-(3)=0
We multiply parentheses
2x+6x-21-3=0
We add all the numbers together, and all the variables
8x-24=0
We move all terms containing x to the left, all other terms to the right
8x=24
x=24/8
x=3
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