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

1/5*z-11.2 = 0 // + 11.2

1/5*z = 11.2 // : 1/5

z = 11.2/1/5

z = 56

z = 56

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