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x in (-oo:+oo)
(2/3)*x-(1/4) = -2 // + 2
(2/3)*x-(1/4)+2 = 0
(2/3)*x-1/4+2 = 0
2/3*x+7/4 = 0 // - 7/4
2/3*x = -7/4 // : 2/3
x = -7/4/2/3
x = -21/8
x = -21/8
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