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9(1+a)=18(a+4)
We move all terms to the left:
9(1+a)-(18(a+4))=0
We add all the numbers together, and all the variables
9(a+1)-(18(a+4))=0
We multiply parentheses
9a-(18(a+4))+9=0
We calculate terms in parentheses: -(18(a+4)), so:We get rid of parentheses
18(a+4)
We multiply parentheses
18a+72
Back to the equation:
-(18a+72)
9a-18a-72+9=0
We add all the numbers together, and all the variables
-9a-63=0
We move all terms containing a to the left, all other terms to the right
-9a=63
a=63/-9
a=-7
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