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2/3-((3/7)*x)-((6/7)*x) = 178/105 // - 178/105
2/3-((3/7)*x)-((6/7)*x)-(178/105) = 0
(-3/7)*x+(-6/7)*x+2/3-178/105 = 0
-9/7*x-36/35 = 0 // + 36/35
-9/7*x = 36/35 // : -9/7
x = 36/35/(-9/7)
x = -4/5
x = -4/5
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