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(4x+20)=(2x+40)
We move all terms to the left:
(4x+20)-((2x+40))=0
We get rid of parentheses
4x-((2x+40))+20=0
We calculate terms in parentheses: -((2x+40)), so:We get rid of parentheses
(2x+40)
We get rid of parentheses
2x+40
Back to the equation:
-(2x+40)
4x-2x-40+20=0
We add all the numbers together, and all the variables
2x-20=0
We move all terms containing x to the left, all other terms to the right
2x=20
x=20/2
x=10
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