Question

5х+2=7х-6



25х-5+35х=7х-245


2х+7=2х-3

Answer 1

1) 7x-5x=2+6
2x=8
x=4
2) 25x+35x-7x=5-245
53x=-240
x=-240/53
x=-4 40/53
3)2x-2x=-7+(-3)
0=-10
Пустое множество.