Question

COMO RESOLVER A EQUAÇAO a/3=-2a/5?

Answer 1

$\dfrac{a}{3} = \dfrac{-2a}{5} \to multiplique~~cruzado:\\\\\\ 5a=-6a\to \\\\ 5a+6a=0\to \\\\ 11a=0\to \\\\ a= \dfrac{0}{11} \to \\\\\\ \boxed{a=0}$

Answer 2

a = - 2a
3      5

5a = 3.(-2a)
5a = - 6a
5a + 6a = 0
11a = 0
a = 0/11
a = 0