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40-5(4-3a)=5(2a+7)
We move all terms to the left:
40-5(4-3a)-(5(2a+7))=0
We add all the numbers together, and all the variables
-5(-3a+4)-(5(2a+7))+40=0
We multiply parentheses
15a-(5(2a+7))-20+40=0
We calculate terms in parentheses: -(5(2a+7)), so:We add all the numbers together, and all the variables
5(2a+7)
We multiply parentheses
10a+35
Back to the equation:
-(10a+35)
15a-(10a+35)+20=0
We get rid of parentheses
15a-10a-35+20=0
We add all the numbers together, and all the variables
5a-15=0
We move all terms containing a to the left, all other terms to the right
5a=15
a=15/5
a=3
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