Let L be a line in R2 that is given by the equation

5x + 3y + 7 = 0,

let π : R^2 -> R^2 be a reflection along the line L, and let L' be a line in R^2 that is given by

the equation 3x − 5y + 3 = 0. Find real numbers B and C such that π(L') is given by

x + By + C = 0.