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5x-2(20-x)=51
We move all terms to the left:
5x-2(20-x)-(51)=0
We add all the numbers together, and all the variables
5x-2(-1x+20)-51=0
We multiply parentheses
5x+2x-40-51=0
We add all the numbers together, and all the variables
7x-91=0
We move all terms containing x to the left, all other terms to the right
7x=91
x=91/7
x=13
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