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a-30=-5(6+6a)
We move all terms to the left:
a-30-(-5(6+6a))=0
We add all the numbers together, and all the variables
a-(-5(6a+6))-30=0
We calculate terms in parentheses: -(-5(6a+6)), so:We get rid of parentheses
-5(6a+6)
We multiply parentheses
-30a-30
Back to the equation:
-(-30a-30)
a+30a+30-30=0
We add all the numbers together, and all the variables
31a=0
a=0/31
a=0
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