Đáp án:

 X = 100

Giải thích các bước giải:

 $\frac{x - 90}{10}$ + $\frac{x - 76}{12}$ + $\frac{x - 58}{14}$ + $\frac{x - 36}{16}$ + $\frac{x - 15}{17}$ = 15

$\frac{x - 90}{10}$ + $\frac{x - 76}{12}$ + $\frac{x - 58}{14}$ + $\frac{x - 36}{16}$ + $\frac{x - 15}{17}$ - 15 = 0

$\frac{x - 90}{10}$ - 1 + $\frac{x - 76}{12}$ - 2 + $\frac{x - 58}{14}$ - 3 + $\frac{x - 36}{16}$ - 4 + $\frac{x - 15}{17}$ - 5 = 0

$\frac{x - 100}{10}$ + $\frac{x - 100}{12}$ + $\frac{x - 100}{14}$ + $\frac{x - 100}{16}$ + $\frac{x - 100}{17}$ = 0

(x - 100).($\frac{1}{10}$ + $\frac{1}{12}$ + $\frac{1}{14}$ + $\frac{1}{16}$ + $\frac{1}{17}$ ) = 0

x - 100 = 0

x = 100

Vậy x = 100

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