2/5x+3/10x=21

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Solution for 2/5x+3/10x=21 equation: 


x in (-oo:+oo)

(2/5)*x+(3/10)*x = 21 // - 21

(2/5)*x+(3/10)*x-21 = 0

7/10*x-21 = 0 // + 21

7/10*x = 21 // : 7/10

x = 21/7/10

x = 30

x = 30

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