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7(a+5)=3(a+9)
We move all terms to the left:
7(a+5)-(3(a+9))=0
We multiply parentheses
7a-(3(a+9))+35=0
We calculate terms in parentheses: -(3(a+9)), so:We get rid of parentheses
3(a+9)
We multiply parentheses
3a+27
Back to the equation:
-(3a+27)
7a-3a-27+35=0
We add all the numbers together, and all the variables
4a+8=0
We move all terms containing a to the left, all other terms to the right
4a=-8
a=-8/4
a=-2
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