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b) -3r - 6z + 1
c) - 4k * (-15)
d) 7 * 0,3x
e) 0,(6)z lub w ułamku zwykłym 2/3z
b) -3r-6z+1
c) -4k * (-15)
d) 7*0,3x
e) -4y
f) 0,666z