3(x-120)-(x-120)=120?
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3(x-120)-(x-120)=120?3(x-120)-(x-120)=120?3(x-120)-(x-120)=120?3(x-120)-(x-120)=1202(x-120)=120x-120
3(x-120)-(x-120)=120?
3(x-120)-(x-120)=120?
3(x-120)-(x-120)=120?
3(x-120)-(x-120)=120
2(x-120)=120
x-120=60
x=180
3(x-120)-(x-120)=120
2（x-120)=120
x-120=60
x=180
3(x-120)-(x-120)=120
2x-240=120
2x=360
x=180
x=180
3(x-120)-(x-120)的结果是2(x-120)
∴3(x-120)-(x-120)=120，即2(x-120)=120，∴x-120=60，∴x=120+60，∴x=180
证明(x+1)(X+3)(x+5)(x+7)+15=(X+8x)+22(x+8x)+120
(3x*x+3x*x+x*x)*2=120,
x(120+x)*80％=x-76
x(x+1)(x-1)=120
x-x/4-120=x/2
0.5X+120+0.3X=X
x/（120-x）=x/60
x/(120-x)=(60-x)/60
25%X+三分之一X+120=X
536-120%x-x=x-80
(32-2x)x=120 (x+3)^2=-x(x+5) 两个方程
3(x-120)-(x-120)=120?
3x+(120-x)/3=120
120/x=120/(X-2)-3
60+3x=120+2x x=?
2X+X+2x+5/3=120
计算x-2/5x+120=3/4x
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