pls pomóżcie potrzebuje to na jutro, a średnio to rozumiem

zad. 4
a) 5x + 4 = 10 |-4
5x = 6 |:5
x = 6/5
b) 3x - 5 = 9
3x = 14
x = 14/3 = 4 2/3
c) -2x + 3 = 7
-2x = 4
-x = 2
x = -2
d) -4x - 3 = 13
-4x = 16
-x = 4
x = -4
zad.5
a) x + 8 = 100
x = 92
b) x - 6 =8
x = 14
c) x + 1 = -6
x = -7