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x = ( ay + b ) / ( cy + d )
x ( cy + d ) = ay + b
xcy + xd = ay + b
xcy - ay = b - xd
y ( xc - a ) = b - xd
y = ( b - xd ) / ( xc - a )
y = - ( xd - b )/ - ( a - xc )
y = ( xd - b ) / ( a - xc )
Solución : Es la respuesta " B ) "