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x in (-oo:+oo)
(-6/7)*x = 1/2 // - 1/2
(-6/7)*x-(1/2) = 0
(-6/7)*x-1/2 = 0
-6/7*x-1/2 = 0 // + 1/2
-6/7*x = 1/2 // : -6/7
x = 1/2/(-6/7)
x = -7/12
x = -7/12
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