3x - 6 = 15
3x - 6 + 6 = 15 + 6 (NOTE: In an equation with =, you can do ANYTHING you want to the problem as long as you do the exact same thing to both sides.)
3x = 21
x = 7
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3x+12 = 18 3x = 18-12 3x = 6 x = 2
if you meant 5x+9=3*15 then, 5x = 36, x = 7.2 if you meant 5x+9=3x+15 then, 2x = 6, x = 3
7-3x = -4x + 13x = 6
5x2y = 3x - 6y 5x2y + 6y = 3x y(5x2 + 6) = 3x y = (3x)/(5x2 + 6) This is a rational function.
6x + 6 = 3x - 2 Bring 3x to the left and subtract: 6x - 3x = 3x 3x + 6 = -2 -2 - 6 = -8 -8 / 3 X = -8/3