20%x=(520-x)*12.5%,

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20%x=(520-x)*12.5%,20%x=(520-x)*12.5%,20%x=(520-x)*12.5%,20%x=(520-x)*12.5%0.2x=520*0.125-0.125x0.32

20%x=(520-x)*12.5%,
20%x=(520-x)*12.5%,

20%x=(520-x)*12.5%,
20%x=(520-x)*12.5%
0.2x=520*0.125-0.125x
0.325x=0.125*520
x=200

上式即：
0.2*x=0.125*(520-x)
0.2*x=65-0.125x
(0.125+0.2)x=65
0.325x=65
x=65/0.325
x=200

20%x=(520-x)*12.5%, （X+X)+(X-X)+(X*X)+(X/X)=100 x-20%x=45+20%x x+x²=20,x=? x - 15%x+20%x=23. x-0.3x-0.5x=20 0.88（X+20%X)=X+84 X-30%X+8-X=20 x*x*(1/4)=20x x(x-20)=x+10 30%x=50%x-20x X-12.5%X=(56-X)+12.5%X x+12.5=3.5x x+12.5=3.5x x+12.5=3.5x 12.5％x+1=x 12.5％x+1=x 12.5-0.25X=X