7) -0.5(x - 4) - 7.3 = 0.8(2 - x)

-0.5x + 2 - 7.3 = 1.6 - 0.8x => -0.5x + 0.8x = 1.6 + 5.3 => 0.3x = 6.9 => x = 6.9 / 0.3 = 23