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8(-3+2a)+3(7a-4)=5a-45
We move all terms to the left:
8(-3+2a)+3(7a-4)-(5a-45)=0
We add all the numbers together, and all the variables
8(2a-3)+3(7a-4)-(5a-45)=0
We multiply parentheses
16a+21a-(5a-45)-24-12=0
We get rid of parentheses
16a+21a-5a+45-24-12=0
We add all the numbers together, and all the variables
32a+9=0
We move all terms containing a to the left, all other terms to the right
32a=-9
a=-9/32
a=-9/32
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