(21-x) * 5 / 13 = 13-x how to solve the equation?

(21-x)*5=13(13-x)
105-5x=169-13x
8x=64
x=8

The solution equation is: 4:65 / 6 = x: 6.5 21% (X-5) = 7x9

4: 65 / 6 = x: 6.5
4*6.5=65/6*x
x=4*6.5÷65/6
x=2.4
21%（X-5）=7X9
x-5=63÷21%
x-5=300
x=300+5
x=305

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