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x+3y=5
sustitución:
y=10-2x
x+3(10-2x)=5
x+30-6x=5
-5x+30=5
30-5=5x
25=5x
5=x
y=10-2(5)
y=10-10
y=0
2x+3y=6
x+y=2
igualación:
y=2-x
y=2-0
y=2
2x+3(2-x)=6
2x+6-3x=6
-x=6-6
x=0
3x+2y=6
x+2y=3(-)
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3x+2y=6
-x-2y=-3
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2x=3
x=3/2
3/2+2y=3
3+4y=3*2
3+4y=6
4y=6-3
4y=3
y=3/4