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40a-40-90a+45=12a-24
We move all terms to the left:
40a-40-90a+45-(12a-24)=0
We add all the numbers together, and all the variables
-50a-(12a-24)+5=0
We get rid of parentheses
-50a-12a+24+5=0
We add all the numbers together, and all the variables
-62a+29=0
We move all terms containing a to the left, all other terms to the right
-62a=-29
a=-29/-62
a=29/62
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