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a in (-oo:+oo)
5*(3*a-8) = -190 // + 190
5*(3*a-8)+190 = 0
5*(3*a-8)+190 = 0
15*a+150 = 0
15*a+150 = 0
15*a+150 = 0 // - 150
15*a = -150 // : 15
a = -150/15
a = -10
a = -10
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