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What is the value of a in the equation 3 a+b = 54, when b = 9?
15
18
21
27
15 because the first thing you have to do is plug in 9 so the equation would then be 3a +9 = 54, then you would subtract 9 from both sides and then you would get 3a = 45 and then divide both sides by 3 and you would get a= 15
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