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(a+3)(4)=36
We move all terms to the left:
(a+3)(4)-(36)=0
We multiply parentheses
4a+12-36=0
We add all the numbers together, and all the variables
4a-24=0
We move all terms containing a to the left, all other terms to the right
4a=24
a=24/4
a=6
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