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(x+5)=2(4x+20)
We move all terms to the left:
(x+5)-(2(4x+20))=0
We get rid of parentheses
x-(2(4x+20))+5=0
We calculate terms in parentheses: -(2(4x+20)), so:We get rid of parentheses
2(4x+20)
We multiply parentheses
8x+40
Back to the equation:
-(8x+40)
x-8x-40+5=0
We add all the numbers together, and all the variables
-7x-35=0
We move all terms containing x to the left, all other terms to the right
-7x=35
x=35/-7
x=-5
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