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4x+2(20-x)=66
We move all terms to the left:
4x+2(20-x)-(66)=0
We add all the numbers together, and all the variables
4x+2(-1x+20)-66=0
We multiply parentheses
4x-2x+40-66=0
We add all the numbers together, and all the variables
2x-26=0
We move all terms containing x to the left, all other terms to the right
2x=26
x=26/2
x=13
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