Решить уравнения: 1. 7 х+25=10 х+16 2. 3 у+16=8 у-9 3. 0.4 (6 у-7) = 0.5 (3 у+7) 4. 4 (2-х) = 7 (2 х-4) 5. 3 (2 х-1) + 7=4 6. 5 у-7=11+2 у 7. 9.6 - (2.6-х) = 4

7 х+25=10 х+16 = = > 10x-7x=25-16 = = > 3x=9 = = > x=9/3=3

3 у+16=8 у-9 = = > 8y-3y=16+9 = = > 5y=25 = = > y=25/5=5

0.4 (6 у-7) = 0.5 (3 у+7) = = > 4 * (6 у-7) = 5 * (3 у+7) = = > 24y - 28 = 15y + 35 = = > 9y=63 = = > y=7

4 (2-х) = 7 (2 х-4) = = > 8 - 4x = 14x - 28 = = > 14x+4x=8+28 = = > 18x=36 = = > x = 2

3 (2 х-1) + 7=4 = = > 6x-3+7 = 4 = = > 6x=4-4=0 = = > x=0

5 у-7=11+2 у = = > 5y-2y=11+7 = = > 3y=18 = = > y = 6

9.6 - (2.6-х) = 4 = = > 9.6-2.6 + x = 4 = = > 7+x = 4 = = > x=4-7=-3

1. 7 х+25=10 х+16

7 х-10 х=16-25

-3 х=-9

х=3

2. 3 у+16=8 у-9

3 у-8 у=-9-16

-5 у=-25

у=5

3. 0.4 (6 у-7) = 0.5 (3 у+7)

2,4 у-2,8=1,5 у+3,5

2,4 у-1,5 у=3,5+2,8

0,9 у=6,3

у=7

4. 4 (2-х) = 7 (2 х-4)

8-4 х=14 х-28

-4 х-14 х=-28-8

-18 х=-36

х=2

5. 3 (2 х-1) + 7=4

6 х-3+7=4

6 х=4+3-7

6 х=0

х=0

6. 5 у-7=11+2 у

5 у-2 у=11+7

3 у=18

у=6

7. 9.6 - (2.6-х) = 4

9,6-2,6+х=4

7+х=4

х=4-7

х=-3