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podaje same wyniki:
a) 7x + 3y
b) -1a + 1
c) -4x + 7
d) 2a + 3b
e) -2x - 1
f) -3y + x
g) 6x - 4
h) -2y - 11
i) -5a -1
j) -3½ + 3x
Zadanie 9
x + (-x) + y = y
x - y + (-x) + y + z = z
x - y + 2(-x) + 2y = y - x
Zadanie 10
a) 4000 - (x+x*10) = 4000 - 11x
b) x + 4 * x + x + 20%x = 2,45x
c) 60t + 70t = 130t