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x in (-oo:+oo)
X-(3/7) = (2/3)*((3/2)*x-(9/14)) // - (2/3)*((3/2)*x-(9/14))
X-((2/3)*((3/2)*x-(9/14)))-(3/7) = 0
(-2/3)*((3/2)*x-9/14)+X-3/7 = 0
X-2/3*(3/2*x-9/14)-3/7 = 0
(-2/3*7*(3/2*x-9/14))/7+(7*X)/7-3/7 = 0
7*X-2/3*7*(3/2*x-9/14)-3 = 0
7*X-7*x-3+3 = 0
7*X-7*x = 0
(7*X-7*x)/7 = 0
(7*X-7*x)/7 = 0 // * 7
7*X-7*x = 0
7*X-7*x = 0 // - 7*X
-7*x = -(7*X) // : -7
x = (-(7*X))/(-7)
x = X
x = X
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