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x in (-oo:+oo)
(9/5)*(3-7*x) = 8 // - 8
(9/5)*(3-7*x)-8 = 0
9/5*(3-7*x)-8 = 0
9/5*(3-7*x)-8 = 0
-63/5*x-13/5 = 0
-63/5*x-13/5 = 0
-63/5*x-13/5 = 0 // + 13/5
-63/5*x = 13/5 // : -63/5
x = 13/5/(-63/5)
x = -13/63
x = -13/63
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