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x in (-oo:+oo)
(1/4)*x = -13/2 // + -13/2
(1/4)*x-(-13/2) = 0
(1/4)*x+13/2 = 0
1/4*x+13/2 = 0 // - 13/2
1/4*x = -13/2 // : 1/4
x = -13/2/1/4
x = -26
x = -26
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