6a+3b, 10c-12d, 28e+21, 6f-6, 18ax-15ay, 51cu+17cv, 15ab-3a, 12s+48bs, -5mx-10my, 12s+48bs, -40ay-8a, 7a+7b+7c, 12a-8b+20c, 5ax-15bx-30x, -18-24ay-6y, mx+my+3mz, 7bt-21b-35bt, 3sd+36as-15as, -8xyz-18yz+6xz, 3a(x+y)-4b(x+y)

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