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a in (-oo:+oo)
6*(-5*a-2) = -192 // + 192
6*(-5*a-2)+192 = 0
6*(-5*a-2)+192 = 0
180-30*a = 0
180-30*a = 0
180-30*a = 0 // - 180
-30*a = -180 // : -30
a = -180/(-30)
a = 6
a = 6
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