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5(4a+5)=(a-4)
We move all terms to the left:
5(4a+5)-((a-4))=0
We multiply parentheses
20a-((a-4))+25=0
We calculate terms in parentheses: -((a-4)), so:We get rid of parentheses
(a-4)
We get rid of parentheses
a-4
Back to the equation:
-(a-4)
20a-a+4+25=0
We add all the numbers together, and all the variables
19a+29=0
We move all terms containing a to the left, all other terms to the right
19a=-29
a=-29/19
a=-1+10/19
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