3x/10+9x/5=21 - solution

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Solution for 3x/10+9x/5=21 equation:

x in (-oo:+oo)

(3*x)/10+(9*x)/5 = 21 // - 21

(3*x)/10+(9*x)/5-21 = 0

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

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

x = 21/21/10

x = 10

x = 10

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