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-15=4a-5
We move all terms to the left:
-15-(4a-5)=0
We get rid of parentheses
-4a+5-15=0
We add all the numbers together, and all the variables
-4a-10=0
We move all terms containing a to the left, all other terms to the right
-4a=10
a=10/-4
a=-2+1/2
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