Answer :

if:
[tex] \left \{ {{-2y+6y=6} \atop {-7x+8y=-5}} \right. [/tex]
4y=6
y=1,5
8y=12
-7x=-17
x=[tex]2 \frac{3}{7} [/tex]
answer: {[tex]2 \frac{3}{7};1,5} [/tex]}

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