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x in (-oo:+oo)
(-1/3)*x-(5/7) = 1/2 // - 1/2
(-1/3)*x-(5/7)-(1/2) = 0
(-1/3)*x-5/7-1/2 = 0
-1/3*x-17/14 = 0 // + 17/14
-1/3*x = 17/14 // : -1/3
x = 17/14/(-1/3)
x = -51/14
x = -51/14
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