0.5x-0.7=6.5-1.3x
1.8x=7.2
x=4
65％（y-1）=37％（y+1）-0.82
25%y=1.02-0.82
y=0.8
2.4-y-4 / 2.5=0.6y
1.6y=0.8
y=0.5
x+1 / 0.2 - 3x-1 / 0.4 = 1
2x+2-3x+1=0.4
x=2.6
0.1x-0.2 / 0.02 - x+1 / 0.5 =3
5x-10-2x-2=3
x=5