[tex]2x - {y}^{2} + 3 {y}^{2} - x + {x}^{2} = x + 2 {y}^{2} + {x}^{2} [/tex]
[tex] - 4 {a}^{2} + a - {b}^{2} - 2a - a + 2 {b}^{2} = - 4 {a}^{2} - 2a + {b}^{2} [/tex]
[tex]5 {x}^{2} - {y}^{3} - x + {y}^{3} - 2 {x}^{2} - x = 3 {x}^{2} - 2x[/tex]
a) 2x-y²+3y²-x+x²=2y²+x+x²
c)-4a²+a-b²-2a-a+2b²=b²-2a-4a²
e)5x²-y³-x+y³-2x²-x=3x²-2x
