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4a+7=-2a+19
We move all terms to the left:
4a+7-(-2a+19)=0
We get rid of parentheses
4a+2a-19+7=0
We add all the numbers together, and all the variables
6a-12=0
We move all terms containing a to the left, all other terms to the right
6a=12
a=12/6
a=2
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