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-12a-16a+(-14a)-(-19a)+6a=(-7)
We move all terms to the left:
-12a-16a+(-14a)-(-19a)+6a-((-7))=0
We add all the numbers together, and all the variables
-22a+(-14a)-(-19a)+7=0
We get rid of parentheses
-22a-14a+19a+7=0
We add all the numbers together, and all the variables
-17a+7=0
We move all terms containing a to the left, all other terms to the right
-17a=-7
a=-7/-17
a=7/17
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