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-15=5a*12-2a+6
We move all terms to the left:
-15-(5a*12-2a+6)=0
We add all the numbers together, and all the variables
-(-2a+5a*12+6)-15=0
We get rid of parentheses
2a-5a*12-6-15=0
We add all the numbers together, and all the variables
2a-5a*12-21=0
Wy multiply elements
2a-60a-21=0
We add all the numbers together, and all the variables
-58a-21=0
We move all terms containing a to the left, all other terms to the right
-58a=21
a=21/-58
a=-21/58
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