4/5x-65/100x=21

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Solution for 4/5x-65/100x=21 equation: 


x in (-oo:+oo)

(4/5)*x-((65/100)*x) = 21 // - 21

(4/5)*x-((65/100)*x)-21 = 0

(4/5)*x+(-13/20)*x-21 = 0

3/20*x-21 = 0 // + 21

3/20*x = 21 // : 3/20

x = 21/3/20

x = 140

x = 140

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