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(72)=(4x+20)
We move all terms to the left:
(72)-((4x+20))=0
We calculate terms in parentheses: -((4x+20)), so:We get rid of parentheses
(4x+20)
We get rid of parentheses
4x+20
Back to the equation:
-(4x+20)
-4x-20+72=0
We add all the numbers together, and all the variables
-4x+52=0
We move all terms containing x to the left, all other terms to the right
-4x=-52
x=-52/-4
x=+13
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