3X-15=x+15 2x-4=x+4 5x=4(x+2,5) 2(x+20)=7x+20 3(x-3)=x+3 ps. prosze o rozwiązanie do godziny 15:30

3X-15=x+15 3x - x = 30 2x = 30/2 x = 15 2x-4=x+4 2x - x = 8 x = 8 5x=4(x+2,5) 5x - 4x= 9 x = 9 2(x+20)=7x+20 2x + 40 = 7x +20 2x - 7x = 20 - 40 -5x = - 20/:(-5) x = 4 3(x-3)=x+3 3x - 9 = x + 3 3x - x = 3 +9 2x = 12 /:2 x = 6

3x- 15= x+15 3x-x=15+15 2x=30/ :2 x= 15 2x-4=x+4 2x-x=4+4 x=8 5x=4(x+2,5) 5x=4(2,5x) 5x-2,5x=4 2,5x=4/ :2,5 x=1,6 2(x+20)=7x+20 20x-7x=20-2 13x=18/:13 x~ 1,38 3(x-3)=x+3 -3x-x=3+3 -4x=6/ :(-4) x=-1,5 :)

3X-15=x+15 3x-x=15+15 2x=30/2 x=15 2x-4=x+4 2x-x=4+4 x=8 5x=4(x+2,5) 5x=4x+10 5x-4x=10 x=10 2(x+20)=7x+20 2x+40=7x+20 2x-7x=-40+20 -5x=-20/(-5) x=4 3(x-3)=x+3 3x-9=x+3 3x-x=9+3 2x=12/2 x=6