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12+-14a=-15a+5
We move all terms to the left:
12+-14a-(-15a+5)=0
We add all the numbers together, and all the variables
-14a-(-15a+5)=0
We get rid of parentheses
-14a+15a-5=0
We add all the numbers together, and all the variables
a-5=0
We move all terms containing a to the left, all other terms to the right
a=5
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