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In the diagram ABC is equal to DEC what is the value of x?

In the diagram ABC is equal to DEC what is the value of x?
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In the diagram ABC is equal to DEC what is the value of x?

In the diagram ABC is equal to DEC what is the value of x?-example-1
User Ivan Pronin
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\begin{gathered} (25)/(5)=(18-x)/(x) \\ 25x=(18-x)*5 \\ 25x=90-5x \\ 25x+5x=90-5x+5x \\ 30x=90 \\ (30x)/(30)=(90)/(30) \\ x=3 \end{gathered}

User Shuvojit
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