3x+5x-2x= - 6x, -7a • 5b= - -35ab, 42abc : (-6bc)= - -7a, 3b-2a+8b+5a= - 11b+3a, 3a-2b+7a-4b= - 10a-6b, -c+15b+7ab-4b-11b-7ab = - -c, 8a-(2x•10b)= - 8a-20xb, 4(-2a+5xb)= - -8a+20xb, (6m) • (-3n) = - -18mn, 7a + 3b - 4a + 9b - 2a - 6b= - a + 6b, (2a • 3b) + (4b • 5c) - (6a • 2c)= - 6ab+20bc-12ac, (72abcx) : (9bc)= - 8ax, (8xyz) • (6xw) : (4xz)= - 12xyw, (15ab + 8bc + 12ac) - (7ab + 5bc + 4ac)= - 8ab+3bc+8ac, (ab) • (-1) - -ab,

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