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x-y=-2
2x = 2
x = 1
b) 3x+4y=10
2x+y=0
5x+5y=10
x+y=2
c) x+2y=0 x-y=0.3 entonces x=0.3+y
0.3+y+2y=0
3y=-0.3
y=-0.1 entonces x-(-0.1)=0.3
x+0.1=0.3
x=0.3-0.1
x=0.2
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