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d in (-oo:+oo)
124 = 7*d+3*d+4 // - 7*d+3*d+4
124-(7*d)-(3*d)-4 = 0
124-7*d-3*d-4 = 0
120-10*d = 0 // - 120
-10*d = -120 // : -10
d = -120/(-10)
d = 12
d = 12
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