Question

resolva a equação x-1/15=x/20

Answer 1

$\frac{x-1}{15} = \frac{x}{20}$

multiplica cruzado

(x-1).20 = 15.x
20x - 20 = 15x
20x - 15x = 20
5x = 20
x = 20/5
x = 4