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a in (-oo:+oo)
94 = 3*a+7*a+4 // - 3*a+7*a+4
94-(3*a)-(7*a)-4 = 0
94-3*a-7*a-4 = 0
90-10*a = 0 // - 90
-10*a = -90 // : -10
a = -90/(-10)
a = 9
a = 9
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