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

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

z in (-oo:+oo)

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

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

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

-2*z = 0 // : -2

z = 0

z = 0

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