Question

a) x/4-x/6=3
b) 3x/4-x/3=5
c) x/5-1=9
d) x/5+x/2=7/10
e) 8x/3=2x-9
f) -3=x+10

Ajuda ai galera quem sabe por favor ?

Answer 1

a)
$\frac{x}{4} - \frac{x}{6} =3 \\ \\ mmc=12 \\ \\ 3x-2x=36 \\ \\ x=36$

b)
$\frac{3x}{4} - \frac{x}{3} =5 \\ \\ mmc=12 \\ \\ 9x-4x=60 \\ \\ 5x=60 \\ \\ x=60\div5 \\ \\ x=12$

c)
$\frac{x}{5} -1=9 \\ \\ mmc=5 \\ \\ x-5=45 \\ \\ x=45+5 \\ \\ x=50$

d)
$\frac{x}{5} + \frac{x}{2} = \frac{7}{10} \\ \\ mmc(5,2,10)=10 \\ \\ 2x+5x=7 \\ \\ 7x=7 \\ \\ x=7\div7 \\ \\ x=1$

e)
$\frac{8x}{3} =2x-9 \\ \\ mmc=3 \\ \\ 8x=6x-27 \\ \\ 8x-6x=-27 \\ \\ 2x=-27 \\ \\ x=- \frac{27}{2}$

f)
$-3=x+10 \\ \\ -x=10+3 \\ \\ -x=13 \\ \\ x=-13$