Решите уравнения:

3x+7=c

7x-4=x-16

5x + (3x-7) = 9

(7x+1) - (6x+3) = 5

(5x-3) + (7x-4) = 8 - (15-11x)

3x+7=c

3x=c-7

x = (c-7) / 3

7x-4=x-16

7x-x=4-16

6x=-12

x=-12:6

x=-2

5x + (3x-7) = 9

5x+3x-7=9

5x+3x=7+9

8x=16

x=16:8

x=2

(7x+1) - (6x+3) = 5

7x+1-6x-3=5

7x-6x=5-1+3

x=7

(5x-3) + (7x-4) = 8 - (15-11x)

5x-3+7x-4=8-15+11x

5x+7x-11x=3+4+8-15

x=0