Question

Resolva as seguintes equaçoes fracionarias
a) $\frac{72-3x}{x} = 15$
b)$\frac{6}{x-8} = \frac{4}{x}$
c) $\frac{9-x}{3x+5} = \frac{1}{2}$

Answer 1

a) 72-3x/x=15
72-3x=15x
72=18x
x=4

b) 6/x-8=4/x
4x-32=6x
-2x=32
x=32/-2
x=-16

c)9-x/3x+5=1/2
18-2x=3x+5
18-5=3x+2x
13=5x
x=13/5