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x in (-oo:+oo)
(1/3)*x-(15/4) = -23/4 // + -23/4
(1/3)*x-(15/4)-(-23/4) = 0
(1/3)*x-15/4+23/4 = 0
1/3*x+2 = 0 // - 2
1/3*x = -2 // : 1/3
x = -2/1/3
x = -6
x = -6
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