Question

Aflati numarul natural x incat egalitatea sa fie adevarata :
$\frac{7x+21}{x+2}$ = $\frac{x+3}{5}$

Answer 1

(7x+21)/(x+2)=(x+3)/5
35x+105=x²+2x+3x+6
x²-30x-99=0
(x+3)(x-33)=0
x=-3
x=33

Answer 2

NU E CLASA 8 A
SCOT FACTOR PE 7
7(x+3)/x+2=x+3/5
impart la x+3
7/x+2=1/5
x+2=35
x=33