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90=5(8a-14)
We move all terms to the left:
90-(5(8a-14))=0
We calculate terms in parentheses: -(5(8a-14)), so:We get rid of parentheses
5(8a-14)
We multiply parentheses
40a-70
Back to the equation:
-(40a-70)
-40a+70+90=0
We add all the numbers together, and all the variables
-40a+160=0
We move all terms containing a to the left, all other terms to the right
-40a=-160
a=-160/-40
a=+4
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