Respuesta :

AL2006

You said . . . . .  7 - 5R = n

Subtract  7  from each side . . . . .  -5R = n - 7

Divide each side by  5 . . . . .  -R = (n - 7) / 5

Multiply each side by  -1 . . . . .  R = (7 - n) / 5