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50=10(-3+a)
We move all terms to the left:
50-(10(-3+a))=0
We add all the numbers together, and all the variables
-(10(a-3))+50=0
We calculate terms in parentheses: -(10(a-3)), so:We get rid of parentheses
10(a-3)
We multiply parentheses
10a-30
Back to the equation:
-(10a-30)
-10a+30+50=0
We add all the numbers together, and all the variables
-10a+80=0
We move all terms containing a to the left, all other terms to the right
-10a=-80
a=-80/-10
a=+8
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