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19a-7=-3a+12
We move all terms to the left:
19a-7-(-3a+12)=0
We get rid of parentheses
19a+3a-12-7=0
We add all the numbers together, and all the variables
22a-19=0
We move all terms containing a to the left, all other terms to the right
22a=19
a=19/22
a=19/22
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