Question

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

Answer 1

1)

$displaystyle tt frac{35}{x+5}=frac{7}{15}:::::|:xne-5\\ displaystyle tt 525=7(x+5)::::|div7\displaystyle tt 75=x+5\displaystyle tt -x=5-75\displaystyle tt -x=-70\displaystyle tt bold{x=70}$

2)

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