Odpowiedź:
a) 4x(x-3) = 12
x-3 = 12
x = 12 + 3
x1 = 15
4x = 12
x = 12/4
x2 = 3
b) -2(y-5) = - 30
-2y + 10 = - 30
-2y = -30 - 10
-2y = -40
y = -40/-2
y = 20
c) 3(k+1) = 18
3k + 3 = 18
3k = 18 - 3
3k = 15
k = 15/3
k = 5
d) -11(y-3) = 121
-11y + 33 = 121
-11y = 121 - 33
-11y = 88
y = 88/-11
y = -8
e) 15(t+10) = -300
15t + 150 = -300
15t = -300 - 150
15t = -450
t = -450/15
t = -30