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m=12/24
m=1/2
b. 3z+11=-28
3z=-28-11
z=-39/3
z=-13
c. 25-4y=6y+15
-4y-6y=15-25
-10y=-10
y=1
d.-4x-15=1-8x
-4x+8x=1+15
4x=16
x=4
yang e soalnya gk jelas