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x in (-oo:+oo)
-x-(2/7) = x+1/6+2/7 // - x+1/6+2/7
-x-x-(2/7)-(1/6)-(2/7) = 0
-x-x-2/7-1/6-2/7 = 0
-2*x-31/42 = 0 // + 31/42
-2*x = 31/42 // : -2
x = 31/42/(-2)
x = -31/84
x = -31/84
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