zad1. a). 2(3x+2)-3(5x-6)+4(7x+8)=111 b).x+15=8 1/3 c).-3x=3 3/4 d).x/7=4/5

a). 2(3x+2)-3(5x-6)+4(7x+8)=111 6x + 4 -15x + 18 + 28x +32 = 111 19x = 57 | :19 x = 3 b).x+15=8 1/3 x = 8 1/3 - 15 x = - 6 2/3 c).-3x=3 3/4 | : (-3) x = (15/4) : (-3) x = -15/12 x = -1 2/12 d).x/7=4/5 |*7 x = 28/5 x = 5,6

zad1. a). 2(3x+2)-3(5x-6)+4(7x+8)=111 6x+4-15x+18+28x+32=111 6x-15x+28x+18+32+4=111 6x+13x+50+4=111 19x+50=107 19x=57/:19 x=3 b).x+15=8 1/3 x=8 1/3-15 x=-6 2/3 c).-3x=3 3/4 -3x=15/4 /:(-3) x=-15/12 x=-5/4=-1,25 d).x/7=4/5 /^7 x=28/5=5 3/5=5,6