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