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x in (-oo:+oo)
2-((3*x)/4) = 9 // - 9
2-((3*x)/4)-9 = 0
(-3/4)*x-9+2 = 0
-3/4*x-7 = 0 // + 7
-3/4*x = 7 // : -3/4
x = 7/(-3/4)
x = -28/3
x = -28/3
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