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2x+y=7 //×5
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multiplicas y eliminas "y"
4x-5y=35
10x+5y=35 sumas y simplificar
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14x=70
x=70/14
x=5
X reemplazamos en la primera ecuación
4×(5)-5y=35
20-5y=35
-5y=-20+35
-5y=15 //-1
5y=15
y=15/5y
y=3