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x+y=90 y=90-x complemento
entonce
180-x=7/3*(90-x)
3(180-x)=7(90-x)
540-3x=630-7x
7x-3x=630-540
4x=90
x=22,5
de donde : y=180-22,5=157,5 suplemento
y=90-22,5=67,5 complemento