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4x-7(2-x)=3x+21
We move all terms to the left:
4x-7(2-x)-(3x+21)=0
We add all the numbers together, and all the variables
4x-7(-1x+2)-(3x+21)=0
We multiply parentheses
4x+7x-(3x+21)-14=0
We get rid of parentheses
4x+7x-3x-21-14=0
We add all the numbers together, and all the variables
8x-35=0
We move all terms containing x to the left, all other terms to the right
8x=35
x=35/8
x=4+3/8
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