- (4,3a + 2,15) + (0,45 - 3,3a) - (1,7b - 5,9a)= - 4,3a - 2,15 + 0,45 - 3,3a - 1,7b + 5,9a = - 1,7 - 1,7a - 1,7b
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- (4,3a + 2,15) + (0,45 - 3,3a) - (1,7b - 5,9a)= - 4,3a - 2,15 + 0,45 - 3,3a - 1,7b + 5,9a = - 1,7 - 1,7a - 1,7b