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-87=-3(1+4a)
We move all terms to the left:
-87-(-3(1+4a))=0
We add all the numbers together, and all the variables
-(-3(4a+1))-87=0
We calculate terms in parentheses: -(-3(4a+1)), so:We get rid of parentheses
-3(4a+1)
We multiply parentheses
-12a-3
Back to the equation:
-(-12a-3)
12a+3-87=0
We add all the numbers together, and all the variables
12a-84=0
We move all terms containing a to the left, all other terms to the right
12a=84
a=84/12
a=7
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