x-20=150-x+20 [列方程解]

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x-20=150-x+20[列方程解]x-20=150-x+20[列方程解]x-20=150-x+20[列方程解]x-20=150-x+20x+x=150+20+202x=190x=190÷2x=95

x-20=150-x+20 [列方程解]
x-20=150-x+20 [列方程解]

x-20=150-x+20 [列方程解]
x - 20 = 150 - x + 20
x + x = 150 + 20 + 20
2x = 190
x = 190 ÷ 2
x = 95