September 2018 2 19 Report

Usuń nawiasy i zredukuj 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 )


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