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x in (-oo:+oo)
(-1/2)*x-(2/7) = 1/6 // - 1/6
(-1/2)*x-(2/7)-(1/6) = 0
(-1/2)*x-2/7-1/6 = 0
-1/2*x-19/42 = 0 // + 19/42
-1/2*x = 19/42 // : -1/2
x = 19/42/(-1/2)
x = -19/21
x = -19/21
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