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