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-((1/5)*x)-1/7 = 3*x-(239/105) // - 3*x-(239/105)
239/105-((1/5)*x)-(3*x)-1/7 = 0
(-1/5)*x-3*x-1/7+239/105 = 0
32/15-16/5*x = 0 // - 32/15
-16/5*x = -32/15 // : -16/5
x = -32/15/(-16/5)
x = 2/3
x = 2/3
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