a) 6x + 2 = 5x
6x - 5x = -2
x = -2
b) 2y - (5y + 1) = 3
2y - 5y - 1 = 3 (opuściliśmy nawiasy)
-3y - 1 = 3
-3y = 3 + 1
-3y = 4 I: -3
y = - 4/3
y = - 1 1/3
c) 4/5 + x/5 = 4 I*5
4 + x = 20
x = 20 - 4
x = 16
d) x+2/4 + x-1/12 = (x + 5) I*12
3(x + 2) + 1 - x = 12x + 60
3x + 6 + 1 - x = 12x + 60
4x + 6 - 1 = 12x + 60
4x + 5 = 12x + 60
4x - 12x + 5 = 60
4x - 12x = 60 - 5
-8x = 55 I:8
x = - 55/8
x = - 6 7/8
