x+y=170 x-y=20 ¿¿¿como resuelvo este??
x+y=170
x-y=20 --> 2y=150 => y = 150/2 => y=75
x-75=20
x=20+75
x=95
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x+y=170
x-y=20 --> 2y=150 => y = 150/2 => y=75
x-75=20
x=20+75
x=95