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10a + 15b - 6a + 18b - 3a - 3b - 3
(10a - 6a - 3a) + (15b + 18b - 3b) - 3
a + 30b - 3
10a+15b-6a+18b-3a-3b-3
10a-6a-3a+15b+18b-3b-3
a+30b-3
smg berguna^^