Question

а) 9+13x=35+26x
б)7/9x+3=2/3x+5
в) 0,81x-71=1,11x+1
г) 1/3y-4=1/4y-5​

Answer 1

а)

9+13x=35+26x

13x-26x=35-9

-13x=26

x=26/-13

x=-2

в)

0.81х - 71 = 1.11х + 1

0.81х - 1.11х = 1 + 71

-0.3х = 72 | : (-0.3)

х = -240

б)

7/9x+3=2/3x+5

7/9x-2/3x=5-3

3/27х=2

1/9х=2/1

х=2/1:1/9

х=2/1*9/1

х=18

г)

1/3у-1/4у=-5+4

1/12y=-1

y=-1/1/12

y= -12