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7(3a-9)=5(3a-7)-1
We move all terms to the left:
7(3a-9)-(5(3a-7)-1)=0
We multiply parentheses
21a-(5(3a-7)-1)-63=0
We calculate terms in parentheses: -(5(3a-7)-1), so:We get rid of parentheses
5(3a-7)-1
We multiply parentheses
15a-35-1
We add all the numbers together, and all the variables
15a-36
Back to the equation:
-(15a-36)
21a-15a+36-63=0
We add all the numbers together, and all the variables
6a-27=0
We move all terms containing a to the left, all other terms to the right
6a=27
a=27/6
a=4+1/2
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