Выполните сложение (вычитание) переменных.


1) 4х + 8х 2) 5х – 9х 3) 2х + 10х – х 4) – 13х – х

5) 20х – 9х + 6х 6) х + х – 4х 7) 7х + 4х – 9х 8) 2,1х – 3,1х

9) 4,5х – х + 2,5х 10) 17х – 20х – 13х
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