1) To solve 2х-7=х+3, we first need to get all the x terms on one side of the equation.

2х - 7 = x + 3
Subtract x from both sides:
2х - x - 7 = x - x + 3
x - 7 = 3
Add 7 to both sides:
x - 7 + 7 = 3 + 7
x = 10

So, the solution to the equation 2х-7=х+3 is x = 10.

2) To solve 3х-30=х+30, we again want to get all the x terms on one side of the equation.

3х - 30 = x + 30
Subtract x from both sides:
3х - x - 30 = x - x + 30
2х - 30 = 30
Add 30 to both sides:
2х - 30 + 30 = 30 + 30
2х = 60
Divide by 2 to solve for x:
x = 30

So, the solution to the equation 3х-30=х+30 is x = 30.