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兩邊乘以50 15x+35(200-x)=200*27 15x+7000-35x=5400 35x-15x=7000-5400 20x=1600 x=1600÷20 x=80
X+40×15=20X 解方程:40×15=20X-X 600=19X X=31.6
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