Odpowiedź:
a) 7a+4
b)[tex]6+x-13=-7+x[/tex]
c) [tex]-t-3-t+8=-2t+5[/tex]
d)[tex](2x^{2} -8x+7)-(6x^{2} -5x-4)=2x^{2} -8x+7-6x^{2} +5x+4=-4x^{2} -3x+11[/tex]
e) [tex]-2x^{2} +3xy-2y+3x^{2} -xy-y=x^{2} +2xy-3y[/tex]
2a + 5a + 4 = 7a + 4
6 - x - 13 = -7 - x
t - 3 - t + 8 = 5
2x2 - 8x +7 - 6x2 + 5x + 4 = -4x2 - 3x + 11
-2x2 + 3xy - 2y + 3x2 + (-xy) + (-y) = x2 + 2xy - 3y
