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
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
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