Evaluate the following limit$.$ Enter the exact answer in fraction form, if necessary.

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To enter$$$$in your answer field,

When you are in text entry mode $($when your answer field has just one line$),$ type the word$$infinity with a lower case i$.$

When you are in equation editor entry mode $($when your answer field has multiple lines with the equation symbol menu bar$),$ choose the symbol$$$$to enter$$$.$

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limx$$$(5$x$1510$x$12+26$x$15)$limx$$$5$x$1510$x$12+26$x$15=$