x-20/21=-4/7 - solution

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Solution for x-20/21=-4/7 equation:

x in (-oo:+oo)

x-(20/21) = -4/7 // + -4/7

x-(20/21)-(-4/7) = 0

x-20/21+4/7 = 0

x-8/21 = 0 // + 8/21

x = 8/21

x = 8/21

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