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6x+20=2(x+20)
We move all terms to the left:
6x+20-(2(x+20))=0
We calculate terms in parentheses: -(2(x+20)), so:We get rid of parentheses
2(x+20)
We multiply parentheses
2x+40
Back to the equation:
-(2x+40)
6x-2x-40+20=0
We add all the numbers together, and all the variables
4x-20=0
We move all terms containing x to the left, all other terms to the right
4x=20
x=20/4
x=5
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