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Matemàtiques 2 ESO
IDENTITATS I
EQUACIONS INCOMPATIBLES
UNA EQUACIÓ
6x + 2x + 4 = 3x + 3 – 5x – 9
Es resol:
6x + 2x + 4 = 3x + 3 – 5x – 9
6x + 2x – 3x + 5x = - 4 + 3 – 9
10 x = - 10
X = - 1
Una identitat
3x – 4 + 2x – 3 = 4x – 6 + x – 1
Es resol:
3x + 2x – 4x – x = 4 + 3 – 6 – 1
0x = 0
Una equació incompatible
- 4x – 1 + 2x + 5 = 5x + 6 – 7x + 4
Es resol:
- 4x + 2x – 5x + 7x = 1 – 5 + 6 + 4
0x = 6

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Identitats i equacions incompatibles