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51a=6a-90
We move all terms to the left:
51a-(6a-90)=0
We get rid of parentheses
51a-6a+90=0
We add all the numbers together, and all the variables
45a+90=0
We move all terms containing a to the left, all other terms to the right
45a=-90
a=-90/45
a=-2
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