x÷(120-x)=20% X=?
(X+X)+(X-X)+(X*X)+(X/X)=100
(x-22)+(x-24)+(x-27)+(x-20)=x
(x+2005)/ (x+2004)+(x+2007)/(x+2006)=(x+2008)/(x+2007)+(x+20
x(120+x)*80%=x-76
0.88(X+20%X)=X+84
x+x=x+15
x/40+x/60+[20-(x/40+x/60)*8]÷40=x/40+(20-x)/8怎么解
x-30%x=14x+25%x=20
(20-2x)(20-2x)x>400 x=?
(X+X*20%)-[(1200-X)-(1200-X)*20%]=40%
X+X*20%-(1200-X)-(1200-X)*20%=40%
(x-5)÷x=20%咋解