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2. -10x + 5y = 5
Despejo x en 1 y sustituyo en 2.
x = - 25 - 4y
-10(-25 - 4y) + 5y = 5
250 + 40y + 5y = 5
45y = 5 - 250
y = -245 : 45
y = -49/9
x = -25 - 4(-49/9)
x = -29/9
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