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x in (-oo:+oo)
(-3/4)*x = 2/3 // - 2/3
(-3/4)*x-(2/3) = 0
(-3/4)*x-2/3 = 0
-3/4*x-2/3 = 0 // + 2/3
-3/4*x = 2/3 // : -3/4
x = 2/3/(-3/4)
x = -8/9
x = -8/9
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