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número a buscar = x
Dos tercios de un número: (2/3)x
Restamos un tercio : (2/3)x - (1/3)
eso equivale: o sea es igual "="
dos quintos=2/5
mitad=1/2
sumado 2/5 +1/2
(2/3)x - (1/3) = (2/5) + (1/2)
resolviendo
(2x -1)/3 =(4+5)/10
(2x -1)/3 = 9/10
2x - 1 = 27/10
2x = (27/10) + 1
2x = (27+10) / 10
2x = 37/10
x= 37/20 es el número