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4x-5(2x+7)=20
We move all terms to the left:
4x-5(2x+7)-(20)=0
We multiply parentheses
4x-10x-35-20=0
We add all the numbers together, and all the variables
-6x-55=0
We move all terms containing x to the left, all other terms to the right
-6x=55
x=55/-6
x=-9+1/6
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