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(9/7)*z^3 = (x/63)*z^12 // - (x/63)*z^12
(9/7)*z^3-((x/63)*z^12) = 0
9/7*z^3-1/63*x*z^12 = 0 // - 9/7*z^3
-1/63*x*z^12 = -(9/7*z^3) // : -1/63*z^12
x = (-(9/7*z^3))/(-1/63*z^12)
x = 81*z^-9
x = 81*z^-9
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