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2(7-x+4x=20)
We move all terms to the left:
2(7-x+4x-(20))=0
We add all the numbers together, and all the variables
2(3x-13)=0
We multiply parentheses
6x-26=0
We move all terms containing x to the left, all other terms to the right
6x=26
x=26/6
x=4+1/3
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