(1) 2x-1=3 (2)3-4x=2-x (3)0.2x+1=-1.8x (4)1/3x =9 - 2/3x
解 2x =3 解 -4x+x=2-3 解0.2x+1.8x=-1 解1/3x+2/3x=9
x =3/2 ...