a) $$2x - 3 + (3x - 2) = 2x - 3 + 3x - 2 = 5x - 5$$
б) $$(4 - x) - (5 - 2x) = 4 - x - 5 + 2x = x - 1$$
в) $$6 + 2(1.5x - 3) = 6 + 3x - 6 = 3x$$