X/3+5/7=2x/21

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Solution for X/3+5/7=2x/21 equation: 


x in (-oo:+oo)

X/3+5/7 = (2*x)/21 // - (2*x)/21

X/3-((2*x)/21)+5/7 = 0

X/3+(-2/21)*x+5/7 = 0

1/3*X-2/21*x+5/7 = 0 // - 1/3*X+5/7

-2/21*x = -(1/3*X+5/7) // : -2/21

x = (-(1/3*X+5/7))/(-2/21)

x = 21/2*(1/3*X+5/7)

x = 21/2*(1/3*X+5/7)

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