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(...) = 4 - b - 5a
bo ( 3a + 2b - 5 ) + ( 4 - b - 5a ) = 3a + 2b - 5 + 4 - b - 5a = - 2a + b - 1
( 3a + 2b - 5 ) - (...) = - 2a - b + 1
(...) = 5a + 3b - 6
bo ( 3a + 2b - 5 ) - ( 5a + 3b - 6 ) = 3a + 2b - 5 - 5a - 3b + 6 = - 2a - b + 1