1) 1,1x-2,5=0,6x

2) 6,7х=2,25х-9

3) 16-9,5у=3у+21

4) 1,25у+7,5=5y

5) 0,5x-7=—2дробь3х

1,1x-2,5=0,6x

1.1x-0.6x=2.5

0.5x=2.5|:0.5

x=5

6,7х=2,25х-9

6.7x-2.25x=-9

4.45x=-9|;4.45

x=-180 дробь 89

x=2 2дробь 89

16-9,5у=3у+21

-9.5y-3y=21-16

-12.5y=5|:-12.5

y=-0.4

1.25y+7.5=5y

1.25y-5y=-7.5

-3.75y=-7.5|:-3.75

y=2

0,5x-7=-2 дробь 3 х

1 дробь 2 -7=-2 дробь 3 х|*6

3x-42=-4x

3x+4x=42

7x=42|:7

x=6