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24m = 12
m = 12 : 24
m = 1/2
(b)
3z + 11 = - 28
3z = - 28 - 11
z = - 39 : 3
z = - 13
(c)
25 - 4y = 6y + 15
25 - 15 = 6y + 4y
10 = 10 y
y = 1