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a+3(a-7)=19
We move all terms to the left:
a+3(a-7)-(19)=0
We multiply parentheses
a+3a-21-19=0
We add all the numbers together, and all the variables
4a-40=0
We move all terms containing a to the left, all other terms to the right
4a=40
a=40/4
a=10
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