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4p + 1 = (3/5)p + 9,50
4p + 1 = 3p/5 + 9,50
multiplica ambos lados por 5 (para suprimir denominadores)
5(4p) + 5 =3p +5(9,50)
20p + 5 = 3p + 47,50
20p - 3p = 47,50 - 5
17p = 42,50
p = 42,50/17
p = 2,50 pesos por metro.