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b. z=-13
c. y=1
d. x=4
= 12 : 24m
m = - 12
3z + 11 = -28
3z = -28 - 11
3z = -39
-39 : 3 = -13
25 - 4y = 6y + 15
-4y - 6y = 25 - 15
10y = 10
y = 10 : 10
y = 1
-4x - 15 = 1 - 8x
-4x + 8x = 1 + 15
4x = 16
x = 16 : 4
x = 4
6 per a + 2 = 4
6 per a = 4 - 2
6 per a = 2
a = 6 : 2
a = 3