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a in (-oo:+oo)
4*(-3*a-10) = -124 // + 124
4*(-3*a-10)+124 = 0
4*(-3*a-10)+124 = 0
84-12*a = 0
84-12*a = 0
84-12*a = 0 // - 84
-12*a = -84 // : -12
a = -84/(-12)
a = 7
a = 7
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