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