Решите уравнение:
1) 35/х+5=7/15
2) 4х-2/63=2/9

1)

[tex]\displaystyle \tt \frac{35}{x+5}=\frac{7}{15}\:\:\:\:\:|\:x\ne-5\\\\ \displaystyle \tt 525=7(x+5)\:\:\:\:|\div7\\\displaystyle \tt 75=x+5\\\displaystyle \tt -x=5-75\\\displaystyle \tt -x=-70\\\displaystyle \tt \bold{x=70}[/tex]

2)

[tex]\displaystyle \tt \frac{4x-2}{63}=\frac{2}{9}\:\:\:\:|\cdot63\\\\ \displaystyle \tt 4x-2=2\cdot7\\\displaystyle \tt 4x-2=14\\\displaystyle \tt 4x=14+2\\\displaystyle \tt 4x=16\\\displaystyle \tt x=16\div4\\\displaystyle \tt \bold{x=4}[/tex]