How do you solve 3X plus 7 equals 4X?

3x+7=4x
-7
3x=(-)7+4x
-4x
(-)1x=(-)7
________
(-)1
x=7



add (-3x) to each side of equation
3x +7 = 4x
-3x +3x +7 = 4x -3x
0 +7= 1x
7=x