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x in (-oo:+oo)
(-1/3)*x = -9/4 // + -9/4
(-1/3)*x-(-9/4) = 0
(-1/3)*x+9/4 = 0
9/4-1/3*x = 0 // - 9/4
-1/3*x = -9/4 // : -1/3
x = -9/4/(-1/3)
x = 27/4
x = 27/4
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