-3x + 7 = 3x + 19
Transfer like numbers to the opposite side and change its signs.
-3x - 3x = 19 - 7
-6x = 12
-6x / -6 = 12 / -6 - divide both sides by -6 to find x.
x = -2
To check: substitute x with its value in the given equation.
-3x + 7 = 3x + 19
-3(-2) + 7 = 3 (-2) + 19
6 + 7 = -6 + 19
13 = 13 Value is correct.
-4x - 20 = 6x
-4x - 6x = 20 - transfer like numbers and change its signs
-10x = 20
-10x / -10 = 20 / -10 - divide both sides by -10 to find x
x = -2
To check: Substitute x by its value.
-4x - 20 = 6x
-4(-2) - 20 = 6 (-2)
8 - 20 = -12
-12 = -12 value is correct.
