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b) 3z+11=-28
3z = -28 -11
3z = -39
z = -39/3
z = -13
c) 25-4y=6y+15
-4y -6y = 15 -25
-10y = -10
y= -10/ -10
y = 1
d)-4x-15=1-8x
-4x +8x = 1 + 15
4x = 16
x = 16/4
x = 4
jadi M= 2
b) 3z + 11= -28
3z+ 11-11=-28-11
3z = 39
z = 39 dibagi 3 = 13
c)25-4y=6y+15
25-4y-4y=6y-4y+15
25 =2y + 15
25 - 15 =2y
10 =2y
y = 10 dibagi 2 = 5
d)-4x-15=1-8x
-4x-15+15=1+15-8x
-4x = 16 - 8x
-4x+8x = 16 - 8x-8x
4x = 16
x= 16 dibagi 4= 4