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x in (-oo:+oo)
(3/8)*x = 7-(18*x) // - 7-(18*x)
(3/8)*x+18*x-7 = 0
147/8*x-7 = 0 // + 7
147/8*x = 7 // : 147/8
x = 7/147/8
x = 8/21
x = 8/21
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