zad 6 a) 1-3x-88/7=5x 1-3x-=5x /*7 7-21x-88=35x -14x=81 /:(-14) x= =-5 b) -x/2=3x-3+2x/4 /*4 -2x=12x-12+2x -16x=-12 /:(-16) x= c) 3-3x/2=5/8-4x-3/4 /*8 24-12x=5-32x-6 20x=-25 /:20 x=-1¼ d)3-2x/5+8=5x+2/2-x /*10 30-4x+80=50x+10-10x -44x=-100 /:(-44) x=2 zad 7 a) 4 : x = 2 : 5 /*4 x= 2:5*4 x= 1,6 b) 4: 3 = x : 15 /*15 x= 4: 3* 15 x= 20 c) x/15 = 4/3 /*15 x= 4/3 *15= 20 d) x/7 = 7/10 /*7 x= 1,4 e) 3-x/4 = 5/16 /*4 3-x= 5/16* 4 3-x= 1,3 x= 3- 1,3 x= 1,7 f) 3-2x/12 = 3/2 /*12 3-2x= 3/2*12 3-2x= 18 -2x= 15 /:-2 x= -7,5 g) 1-x/4 = 1+ x /4 /*4 1-x= 1=x 2x= 0 x=0 h) 2-3x/6 = 7/3 /*6 2-3x= 7/3* 6 2-3x=14 -3x= 12 /:-3 x= -4 i) x+4/3 = x-2/2 /*6 2(x+4)= 3(x-2) 2x+8= 3x- 6 x= 14
