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Sagot :

-3+x=7 5x=19. 3x+7x=50
X=7+3 X=19:5. 10x=50
X=10. X=50:10
X=5

X+8=11. -2x=9. -4x+9x=45
X=11-8. X=9:-2. 5x=45
X=3. X=45:5
X=9

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