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40=15a-5
We move all terms to the left:
40-(15a-5)=0
We get rid of parentheses
-15a+5+40=0
We add all the numbers together, and all the variables
-15a+45=0
We move all terms containing a to the left, all other terms to the right
-15a=-45
a=-45/-15
a=+3
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