Zad . Usuń nawiasy i zredukuj wyrazy podobne
a) 5x + (2x - 7) - 9x - (-3x + 8) + 20 - 8x =
b) -5x + (-2y + 4x) - (7x - 8y) - x + (2 - 6y) =
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a) 5x + (2x - 7) - 9x - (-3x + 8) + 20 - 8x =5x+2x-7-9x-3x-8+20-8x=-13x+5
b) -5x + (-2y + 4x) - (7x - 8y) - x + (2 - 6y) =-5x-2y+4x-7x+8y-x+2-6y=-9x+2
licze na naj ;d