Question

(COTUCA) Por que a alternativa A esta correta?

Answer 1

$\frac{2x-3}{5} + \frac{x-7}{3} =x+ \frac{3-x}{2} \\ \\ \frac{6(2x-3)+10(x-7)=30x+15(3-x)}{30} \\ \\ 12x-18+10x-70=30x+45-15x \\ \\ 12x+10x-30x+15x=45+18+70 \\ \\ 7x=133 \\ \\ x= \frac{133}{7} \\ \\ x=19$

Primos:  1,2,3,5,7,11,13,17,19....