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x in (-oo:+oo)
X/3 = x/7 // - x/7
X/3-(x/7) = 0
1/3*X-1/7*x = 0 // - 1/3*X
-1/7*x = -(1/3*X) // : -1/7
x = (-(1/3*X))/(-1/7)
x = 7/3*X
x = 7/3*X
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