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3x + 48 = 4x + 28
20 = x
Pasamos los divisores a multiplicar
3 (x+16) = 4 (x+7)
Propiedad distributiba de la multipliccion
3x + 3*16 = 4x + 4*7
Operamos la multiplicacion
3x + 48 = 4x + 28
Ordenamos
48 - 28 = 4x - 3x
Efectuamos
20 = x