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12(-x-y+3) - 4(x – y +1)+8 = 32
2(x + y + 4) = 3(2x +2y-3)+21
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Răspuns :

Răspuns:

-12x-12y+36-4x+4y-4+8 =32

-12x-4x-12y+4y+36-4+8=32

-16x-8y+40=32

-16x-8y=32-40

-16x-8y=-8

-16x=-8/8y

-16x=-y

y=16x