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16a=6a-90
We move all terms to the left:
16a-(6a-90)=0
We get rid of parentheses
16a-6a+90=0
We add all the numbers together, and all the variables
10a+90=0
We move all terms containing a to the left, all other terms to the right
10a=-90
a=-90/10
a=-9
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