-33(х - 12) = 2(х - 6)
3х - 36 = 2х - 12
3х - 2х = 36 - 12
х = 24
2(х + 6) = 1
2х + 12 = 1
2х = - 12 + 1
2х = - 11
х = - 5,5
- 3 (х - 7) = х - 3
- 3х + 21 = х - 3
- 3х - х = - 21 - 3
4х = 24
х = 6
x^2 - 18 = 3x
x^2 - 3x - 18 = 0
D = 9 - 4(-18) = 9 + 72 = 81; Y81 = 9
x1 = (3 + 9) / 2 = 6
x2 = (3 - 9) / 2 = - 3
x^2 + 16 = - 10x
x^2 + 10x + 16 = 0
D = 100 - 4 *16 = 100 - 64 = = 36; YD = 6
x1 = (- 10 + 6) / 2 = - 2
x2 = (-10 - 6) / 2 = - 8
x^2 - 4 = 3x
x^2 - 3x - 4 = 0
D = 9 - 4 (- 4 ) = 9 + 16 = 25; YD = 5
x1 = (3 + 5) / 2 = 4
x2 =(3 - 5) / 2 = - 1.