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-2x + 4y con 6x + 18x
4y - 2x + 6x + 18x= 4Y + 22X
2)x-1 con 3x-3
x-1 + 3x - 3= 4x -4
3)-7x + 9xELEVADO A LA 2 con x4ELEVADO A LA DOS + 18
-7x+9x^2 + x 4^2 + 18= 9x^2 +9x +18