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20=4(x+10)
We move all terms to the left:
20-(4(x+10))=0
We calculate terms in parentheses: -(4(x+10)), so:We get rid of parentheses
4(x+10)
We multiply parentheses
4x+40
Back to the equation:
-(4x+40)
-4x-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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