Question

Уравнение (х+21 3/19)-3 18/18= 21 17/19

Answer 1

(х+21 3/19) - 3 18/18 = 21 17/19
х + 21 3/19 - 4 = 21 17/19
x + 17 3/19 = 21 17/19
x = 21 17/19 - 17 3/19
x = 4 14/19

Answer 2

$\displaystyle \left(x+21 \frac{3}{19}\right)-3 \frac{18}{18}=21 \frac{17}{19}; \\ \\ 3 \frac{18}{18}=4 \to \left(x+21 \frac{3}{19}\right)-4=21 \frac{17}{19}; \\ \\ x+21 \frac{3}{19}-4=21 \frac{17}{19}; \qquad x=21 \frac{17}{19}+4-21 \frac{3}{19}; \\ \\ x=21+4-21+ \frac{17}{19}- \frac{5}{19}; \qquad x=4+ \frac{17-5}{19}; \qquad x=4 \frac{14}{19}$