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a in (-oo:+oo)
5*(7-6*a) = 125 // - 125
5*(7-6*a)-125 = 0
5*(7-6*a)-125 = 0
-30*a-90 = 0
-30*a-90 = 0
-30*a-90 = 0 // + 90
-30*a = 90 // : -30
a = 90/(-30)
a = -3
a = -3
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