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15a+7=3a-67
We move all terms to the left:
15a+7-(3a-67)=0
We get rid of parentheses
15a-3a+67+7=0
We add all the numbers together, and all the variables
12a+74=0
We move all terms containing a to the left, all other terms to the right
12a=-74
a=-74/12
a=-6+1/6
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