[tex]7+ \frac{x}{2} = \frac{x+9}{5} [/tex] решите уравнение пож:). Created by 636364. algebra-ru

tex] решите уравнение пож:)...

irkarom $7+\frac{x}{2} = \frac{x+9}{5}, \\
10\cdot(7+\frac{x}{2}) = 10\cdot \frac{x+9}{5}, \\ 
10\cdot7+10\cdot\frac{x}{2} = 10\cdot \frac{x+9}{5}, \\
70+5\cdot x=2\cdot(x+9), \\
70+5x=2\cdot x+2\cdot9, \\
70+5x=2x+18, \\
5x-2x=18-70, \\
3x=-52, \\
x=- \frac{52}{3} , \\
x=-17 \frac{1}{3} .
$

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