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x+3y=10
-2x+y=6
La podemos resolver por el método de suma y resta
2(x+3y=10)
-2x+y=6
2x+6y=20
-2x+y=6
7y=26
y=26/7
Calculamos x sustituyendo el valor de y
x+3y=10
x+3(26/7)=10
x+ 78/7=10
x=10-78/7
x=-8/7