October 2018 2 11 Report

USUŃ NAWIASY I ZREDAGUJ WYRAZY PODOBNE:

a) 5x + (2x - 7) - 9x - (-3x + 8) + 20 - 8x =

b) -5x + (-2y + 4x ) - (7x - 8y) - x + (2 - 6y) =

c) - 9z - (4 - 3z) - 8y - (-7z + 8y) + (- 2y - 7) =

d) ( 2a + 4 ) - (3a - 5) =


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