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9=3a(3-6)
We move all terms to the left:
9-(3a(3-6))=0
We add all the numbers together, and all the variables
-(3a(-3))+9=0
We calculate terms in parentheses: -(3a(-3)), so:We get rid of parentheses
3a(-3)
We multiply parentheses
-9a
Back to the equation:
-(-9a)
9a+9=0
We move all terms containing a to the left, all other terms to the right
9a=-9
a=-9/9
a=-1
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