if 2x+3=9 then 2x=6 so x=3
5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
(2x + 3)(2x + 3)
3
x=3
2x + 3 = 92x = 9 - 32x = 6x = 6/2x = 3
3x - 3 = 2x + 6 3x = 2x + 9 x = 9
2x-3=4x+9 -2x-12=0 2x=-12 x=-6
2x + 3 = -92x = -12x = -6
If: x+9+5x = 21+2x Then: x = 3
21
2x + 3y = 9x = 3, y = 1 therefore 6 + 3 = 9