$\displaystyle sin (120)/x+10=sin (20)/x$
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$\displaystyle \frac{sin(120)}{x}+10=\frac{sin(20)}{x}$ mulitply both sides through by x gives $\displaystyle sin(120)+10x=sin(20)$ $\displaystyle 10x=sin(20)-sin(120)$ $\displaystyle x=\frac{sin(20)-sin(120)}{10}$
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