Решите уравнение:2)х/5+х/4=х/2-1/4; 3)х/3-х/15=х/5+2/3; 4) х/8-х/6=х/4-7/8

$frac{x}{5} + frac{x}{4} = frac{x}{2}- frac{1}{4}$
$frac{x}{5} + frac{x}{4}- frac{x}{2} =- frac{1}{4}$
$frac{4*x}{4*5} + frac{5*x}{5*4} - frac{10*x}{20} =- frac{1}{4}$
$frac{4x+5x-10x}{20} =- frac{1}{4}$
$- frac{x}{20}=- frac{1}{4}$
$x= frac{1}{4}*20$
x=5

$frac{x}{3} - frac{x}{15} = frac{x}{5} + frac{2}{3}$
$frac{x}{3} - frac{x}{15} - frac{x}{5} = frac{2}{3}$
$frac{5x}{5*3} - frac{x}{15} - frac{3x}{3*5} = frac{2}{3}$
$frac{5x-x-3x}{15} = frac{2}{3}$
$frac{x}{15} = frac{2}{3}$
$x= frac{2}{3} *15=10$
x=10

$frac{x}{8} - frac{x}{6} = frac{x}{4} - frac{7}{8}$
$frac{x}{8} - frac{x}{6} - frac{x}{4} =- frac{7}{8}$
$frac{3x}{3*8} - frac{4x}{4*6} - frac{6x}{6*4} =- frac{7}{8}$
$frac{3x-4x-6x}{24} =- frac{7}{8}$
$- frac{7}{24} x=- frac{7}{8}$
$x=- frac{7}{8} : (- frac{7}{24} )=- frac{7}{8} *(- frac{24}{7} )=3$
x=3