z-5/7=4.2 - solution

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Solution for z-5/7=4.2 equation:

z in (-oo:+oo)

z-(5/7) = 4.2 // - 4.2

z-(5/7)-4.2 = 0

z-5/7-4.2 = 0

z-4.91428571 = 0 // + 4.91428571

z = 4.91428571

z = 4.91428571

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