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m =12:24
=1/2
B.3z+11=-28
3z =-28-11
z =-39:3
=13
C.25-4y=6y+15
-4y-6y=15-25
-10y=-10
y =-10:-10
=1
D.-4x-15=1-8x
-4x+8x=1+15
4x =16
x =16:4
=4