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30=5(a-4)
We move all terms to the left:
30-(5(a-4))=0
We calculate terms in parentheses: -(5(a-4)), so:We get rid of parentheses
5(a-4)
We multiply parentheses
5a-20
Back to the equation:
-(5a-20)
-5a+20+30=0
We add all the numbers together, and all the variables
-5a+50=0
We move all terms containing a to the left, all other terms to the right
-5a=-50
a=-50/-5
a=+10
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