3x+12 = 18 3x = 18-12 3x = 6 x = 2
If x-3x=18 then x equals -9
If: 3x+6 = 18 Then: x = 4
3x=18 x=18/3 x=6
18 = 3x6 = x
3x = 18divide both sides by 3x = 6
18=3(3x-6)
-3x + (-18) = 2x + 7 +18 +18 -3x = 2x +25 -2x -2x -5x = 25 ----- ----- -5 -5 x=-5 *------- equals a division line
-3x+7=2x-18 ---> 7+18=2x-3x ----> 25=5x ----> x=5
3x-18 = 9 Adding 18 on both the sides we get, 3x = 27 Dividing both sides by 3 we get, x = 9.
4x+6-7x+9=18-3x+15=18-3x=3x=-1
6-3x+12=0 6+12-3x=0 18-3x=0 18=3x x=6