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- 5z=24/:(-5)
z= -4,8
b) (4-a)/a=5/3
5a=3(4-a)
5a=12-3a
5a+3a=12
8a=12/:8
a=1,5
c) 3/(y-2)=2/(y-3)
3(y-3)=2(y-2)
3y-9=2y-4
3y-2y= -4+9
y=5