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30=-4x
x=-7,5
b) 6-a/3 = a/2
12-2a=3a
a=12
c) 4/z-1 = 5/ z+2
4z+8=5z-5
z=13
x=-7,5
12-2a=3a
12=5a
a=2,4
4z+8=5z-5
13=z