12a + 4.8 - 5 - 2a - 3a + 3 - 1.5(6-x) - 2(-x-3) + 0.9(5x-1) + 0.8(2y-3) + 8 - 5y - 2(-0.4y) =
12a + 4.8 - 5 - 2a - 3a + 3 - 9 + 1.5x - 2x - 3 - 1.5 + 0.9(5x) - 0.9 + 0.8(2y) - 2.4 + 8 - 5y + 0.8y =
7a - 7.2 + 1.5x - 1.6 + 4.5x + 6.1 + 1.6y - 5 =
7a + 5.9x + 1.6y - 6.2
12a + 4.8 - 5 - 2a - 3a + 3 - 1.5(6-x) - 2(-x-3) + 0.9(5x-1) + 0.8(2y-3) + 8 - 5y - 2(-0.4y) =
12a + 4.8 - 5 - 2a - 3a + 3 - 9 + 1.5x - 2x - 3 - 1.5 + 0.9(5x) - 0.9 + 0.8(2y) - 2.4 + 8 - 5y + 0.8y =
7a - 7.2 + 1.5x - 1.6 + 4.5x + 6.1 + 1.6y - 5 =
7a + 5.9x + 1.6y - 6.2