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f(x) = 2x + 3/(x - 1) x - 1 debe ser diferente de cero
x - 1 = 0
x = 1
Dominio R - {1}
Para encontrar el rango despejas x
y = 2x + 3(x - 1)
y(x - 1) = 2x + 3
yx - y = 2x + 3
yx - 2x = 3 + y Sacas factor comun x
x(y - 2) = 3 + y
x = 3 +y/(y - 2) y - 2 debe ser diferente de cero
y - 2 = 0
y = 2
Rango = R - {2}