metodo de sustitucion
8x-7y=15
x+6y=-5
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y=. -1
x=. +1
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x=. +1
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mayvillacord:
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8x-7y=15
x6y=-5
8x-7(15+1)=-5
8x-105-7=-5
1a=-5+105
1a=100
a=-1+100
a=99
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