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4(2a)-(3a+10)=19
We move all terms to the left:
4(2a)-(3a+10)-(19)=0
We get rid of parentheses
42a-3a-10-19=0
We add all the numbers together, and all the variables
39a-29=0
We move all terms containing a to the left, all other terms to the right
39a=29
a=29/39
a=29/39
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