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a(-15)=4a-3
We move all terms to the left:
a(-15)-(4a-3)=0
We multiply parentheses
-15a-(4a-3)=0
We get rid of parentheses
-15a-4a+3=0
We add all the numbers together, and all the variables
-19a+3=0
We move all terms containing a to the left, all other terms to the right
-19a=-3
a=-3/-19
a=3/19
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