Respuesta :

dalendrk
0.25r - 0.125 + 0.5r = 0.5 + r

0.75r - 0.125 = 0.5 + r    |add 0.125 to both sides

0.75r = 0.625 + r      |subtract r from both sides

-0.25r = 0.625    |divide both sides by (-0.25)

r = - 2.5