解:解方程, 此方程的解为x = 5 5x + 2(40 - x) = 95 5x + 2 × 40 - 2 × x = 95 5x + 80 - 2x = 95 5x - 2x = 95 - 80 3x = 15 x = 15 ÷ 3 x = 15 × 1/3 x = 15/3 ∴x = 5 答:此方程的解为x = 5