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-9a=162/4
We move all terms to the left:
-9a-(162/4)=0
We add all the numbers together, and all the variables
-9a-(+162/4)=0
We get rid of parentheses
-9a-162/4=0
We multiply all the terms by the denominator
-9a*4-162=0
Wy multiply elements
-36a-162=0
We move all terms containing a to the left, all other terms to the right
-36a=162
a=162/-36
a=-4+1/2
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