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-75=10a+15
We move all terms to the left:
-75-(10a+15)=0
We get rid of parentheses
-10a-15-75=0
We add all the numbers together, and all the variables
-10a-90=0
We move all terms containing a to the left, all other terms to the right
-10a=90
a=90/-10
a=-9
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