Question

-2x+7x=9 решите уравнение

Answer 1

$- 2x + 7x = 9 \\ 5x = 9 \\ x = 9 \div 5 \\ x = \frac{9}{5} = 1.8$

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Answer 2

-2x+7x=9

5x=9

x=9:5

x=1.8