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2a-90=-3a+5
We move all terms to the left:
2a-90-(-3a+5)=0
We get rid of parentheses
2a+3a-5-90=0
We add all the numbers together, and all the variables
5a-95=0
We move all terms containing a to the left, all other terms to the right
5a=95
a=95/5
a=19
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