Verified answer

0,4*(6х-7)=0,5* (3х+7)

2,4х-2,8=1,5х+3,5

2,4х-1,5х=3,5+2,8

0,9х=6,3

х=7

7*(1,4у+1,8)-27,6=10,1 у

9,8у+12,6-27,6=10,1у

9,8у-10,1у=15

-0,3у=15

у=15: (-0,3)

у=-50

(2 ц 7/9 z + 3 ц 1/3) *3/5=1/6z +6 ц 1/2

(25/9z+10/3)*3|5=1/6z+ 6ц 1/2

5/3z+2=1/6z+6ц1/2

5\3z-1/6z=4ц1/2

9/6z=9/2

z=9/2:9/6

z=3

а) 0,4(6x-7)=0,5(3x+7)

2,4x-2,8=1,5x+3,5

2,4x-1,5x=2,8+3,5

0,9x=6,3

x=7

б) 7(1,4y+1,8)-27,6=10,1y

9,8y+12,6-27,6=10,1y

9,8у-10,1у=-12,6+27,6

-0,3y=15 |:(-0,3)

y=50

в) (2 7/9z+3 1/3)3/5=1/6z+6 1/2

2 7/15z+3 1/5=1/6z+6 1/2

2 7/15z-1/6z=-3 1/5+6 1/2

3/10z=3 7/10

z=3 7/3