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78=6(1-2a)
We move all terms to the left:
78-(6(1-2a))=0
We add all the numbers together, and all the variables
-(6(-2a+1))+78=0
We calculate terms in parentheses: -(6(-2a+1)), so:We get rid of parentheses
6(-2a+1)
We multiply parentheses
-12a+6
Back to the equation:
-(-12a+6)
12a-6+78=0
We add all the numbers together, and all the variables
12a+72=0
We move all terms containing a to the left, all other terms to the right
12a=-72
a=-72/12
a=-6
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