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x in (-oo:+oo)
2/3-((3/4)*x) = 5/6 // - 5/6
2/3-((3/4)*x)-(5/6) = 0
(-3/4)*x+2/3-5/6 = 0
-3/4*x-1/6 = 0 // + 1/6
-3/4*x = 1/6 // : -3/4
x = 1/6/(-3/4)
x = -2/9
x = -2/9
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