9-7(x+3)=5-6x
9 - 7x - 21 = 5 - 6x
-12 - 7x = 5 - 6x
-7x + 6x = 5 + 12
-x = 17
x = -17
7x+9-(11x-7)=8
7x + 9 - 11x + 7 = 8
-4x + 16 = 8
-4x = 8 - 16
-4x = -8
x = 8:4
x = 2
19,6+y=7(12-y)
19,6 + y = 84 - 7y
y + 7y = 84 - 19,6
8y = 64,4
x = 64,4 : 8
y = 8,05