Mohon Dijawab Dengan Ikhlas Ya....Terimakasih

a. 5x - 3x = 2x
b. 4x + 9 - 1 = 4x + 8
c. 4x - 8x + 12 = -4x + 12
d. -2x - x + 7 + 5 = -3x + 12
[tex]e. \: 3 {x}^{2} + 2 { x}^{2} + 3 {y}^{2} - 5 {y}^{2} + 6xy - 5xy = 5 {x}^{2} - 2 {y}^{2} + xy[/tex]
Semoga benar ;-)