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2(7-x)=20
We move all terms to the left:
2(7-x)-(20)=0
We add all the numbers together, and all the variables
2(-1x+7)-20=0
We multiply parentheses
-2x+14-20=0
We add all the numbers together, and all the variables
-2x-6=0
We move all terms containing x to the left, all other terms to the right
-2x=6
x=6/-2
x=-3
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