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102=-6(1+3a)
We move all terms to the left:
102-(-6(1+3a))=0
We add all the numbers together, and all the variables
-(-6(3a+1))+102=0
We calculate terms in parentheses: -(-6(3a+1)), so:We get rid of parentheses
-6(3a+1)
We multiply parentheses
-18a-6
Back to the equation:
-(-18a-6)
18a+6+102=0
We add all the numbers together, and all the variables
18a+108=0
We move all terms containing a to the left, all other terms to the right
18a=-108
a=-108/18
a=-6
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