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=75+40A
We move all terms to the left:
-(75+40A)=0
We add all the numbers together, and all the variables
-(40A+75)=0
We get rid of parentheses
-40A-75=0
We move all terms containing A to the left, all other terms to the right
-40A=75
A=75/-40
A=-1+7/8
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