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7(3a+4)=(a-1)+19
We move all terms to the left:
7(3a+4)-((a-1)+19)=0
We multiply parentheses
21a-((a-1)+19)+28=0
We calculate terms in parentheses: -((a-1)+19), so:We get rid of parentheses
(a-1)+19
We get rid of parentheses
a-1+19
We add all the numbers together, and all the variables
a+18
Back to the equation:
-(a+18)
21a-a-18+28=0
We add all the numbers together, and all the variables
20a+10=0
We move all terms containing a to the left, all other terms to the right
20a=-10
a=-10/20
a=-1/2
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