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x - Cx = 1/4 * Sx , entonces se tendra
x - (90-x) = 1/4 * (180-x)
x -90+x = 1/4* (180-x)
4(2x -90) = 180-x
8x -360 = 180-x
9x = 360+180 = 540
x = 540/9
x = 60 <------ rpta
espero mis estrellas !!