2/7z-2=9/7z - solution

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Solution for 2/7z-2=9/7z equation:

z in (-oo:+oo)

(2/7)*z-2 = (9/7)*z // - (9/7)*z

(2/7)*z-((9/7)*z)-2 = 0

(2/7)*z+(-9/7)*z-2 = 0

-z-2 = 0 // + 2

-z = 2 // * -1

z = -2

z = -2

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