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7r + 3 = 11r - 21
3 + 21 = 11r - 7r
24 = 4r
24 ÷ 4 = r
6 = r ==> Respuesta
COMPROBAMOS:
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7r + 3 = 11r - 21
7(6) + 3 = 11(6) - 21
42 + 3 = 66 - 21
45 = 45 ==> Correcto
RESPUESTA:
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x = 6
Espero que te ayude.
Saludos!!