3x+5=20 x=5 since 5x3+5=20
23
x=7
x = -8
x2 plus 3x plus 3 is equals to 0 can be solved by getting the roots.
-3x + 5 = 20 -3x = 15 x = -5
3x + 2y = 12 ie 2y = 12 - 3x so y = 6 - 3x/2
x = 6
x = -8
5x3 - 3x2 + 2x = x*(5x2 - 3x + 2) The quadratic has no real factors.
7x = 3x - 12 4x=-12 x=-3
x = 5, y = -1