x/(120-x)=(60-x)/60
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x/(120-x)=(60-x)/60
x/（120-x）=x/60
120+60％x=x
x(x-1)(x+1)=60
60%X + 80%X - 12 = X
60x（x-4)=30x
7x-3x+x=60
x-(25%x+6)=60%x
x - (x - 120)*60%-120=1/4x
60+3x=120+2x x=?
(x+60)x(1+10%)-(1-20%)x=120
（60-x)(120-x)=800x是多少
(120-X)/(60-X)=40%,x等于多少
x+2/3x=60 x-3/5x=120 4x+18x=1x+2/3x=60 x-3/5x=120 4x+18x=132!
x+3分之2 x=60 x-5分之3x=120 4x+18x=132x+3分之2 x=60 x-5分之3x=120 4x+18x=132
x+2/3x=60 x-2/5x=120 4x+18x=132
60%x+0.4x=120
120=-2x+60x+800