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In the adjoining figure, what value of x will make AOB, a straight line ?

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In the adjoining figure, what value of x will make AOB, a straight line ?
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AOB will be a straight line, if `angleAOC+angleBOC=180^(@)`.
`:. (3x+5)+(2x-25)=180`
`implies 5x=200 implies x=40`
Hence, `x=40` will make AOB a straight line.
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