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a in (-oo:+oo)
3*(5*a-7) = 24 // - 24
3*(5*a-7)-24 = 0
3*(5*a-7)-24 = 0
15*a-45 = 0
15*a-45 = 0
15*a-45 = 0 // + 45
15*a = 45 // : 15
a = 45/15
a = 3
a = 3
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