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x in (-oo:+oo)
(-3/4)*x-(5/6) = 2/3 // - 2/3
(-3/4)*x-(5/6)-(2/3) = 0
(-3/4)*x-5/6-2/3 = 0
-3/4*x-3/2 = 0 // + 3/2
-3/4*x = 3/2 // : -3/4
x = 3/2/(-3/4)
x = -2
x = -2
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