7.Zapisz krócej (licz sprytnie): a) -17x-15x-13x-10x+10x+13x+15x+17x b) -10x-8x-6x-2x+2x+4x+6x+8x c)-123x+55x-39x+23x-155x+139x na jutro prosze szybko

a) -17x-15x-13x-10x+10x+13x+15x+17x= 0   b) -10x-8x-6x-2x+2x+4x+6x+8x= -6x   c) -123x+55x-39x+23x-155x+139x=-100x

a) 17x-17x+15x-15x+13x-13x+10x-10x =0 b) 2x-2x+6x-6x+8x-8x+4x-10x=4x-10x=-6x c) 23x-123x+139x-39x+55x-155x= -100x+100x-100x=-100x