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x in (-oo:+oo)
(1/3)*x-((3/7)*x)+3/5 = 793/1155 // - 793/1155
(1/3)*x-((3/7)*x)+3/5-(793/1155) = 0
(1/3)*x+(-3/7)*x+3/5-793/1155 = 0
-2/21*x-20/231 = 0 // + 20/231
-2/21*x = 20/231 // : -2/21
x = 20/231/(-2/21)
x = -10/11
x = -10/11
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