oskar/cours

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#exercice

Simplifier les expressions

2x + 3x
2x + 7 + 2
3x + 9 - x
5x + 4 - x + 2
2(12x + 3)
x(1+2)

Résoudre les équations suivantes

2x = 3x
5x = 15
x + 13 = 14
1-x = 3
1-2x = 1-3x
1+3x = 4+x
2x+13 =4x - 7