7x=6x-7
7x-6x=7
x=7
-3/2x=5/2+x
-3/2x-x=5/2
-5/2x=5/2
x=-1
-2=x+根号2
x=-2-根号2
4-2x=-4x-5
-2x+4x=-5-4
2x=-9
x=-2/9
-0.7y+0.2=-0.3y+0.1
-0.7y+0.3y=0.1-0.2
-0.4y=-0.1
y=-1/4
解:(1)x=-7
(2)-3/2x-x=5/2
-5/2x=5/2
x=-1
(3)x=2+√2
(4)2x=-9
x=-4.5
(5)-0.4y=-0.1
y=2.5
(1)x=-7 (2)x=-1 (3)X=2-根号2 (4)x=-4.5 (5)y=-2.5
6X-7=4X-5 解方程