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-216=-6(1-5a)
We move all terms to the left:
-216-(-6(1-5a))=0
We add all the numbers together, and all the variables
-(-6(-5a+1))-216=0
We calculate terms in parentheses: -(-6(-5a+1)), so:We get rid of parentheses
-6(-5a+1)
We multiply parentheses
30a-6
Back to the equation:
-(30a-6)
-30a+6-216=0
We add all the numbers together, and all the variables
-30a-210=0
We move all terms containing a to the left, all other terms to the right
-30a=210
a=210/-30
a=-7
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