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x in (-oo:+oo)
(1/4)*x = -4.5 // + 4.5
(1/4)*x+4.5 = 0
1/4*x+4.5 = 0 // - 4.5
1/4*x = -4.5 // : 1/4
x = -4.5/1/4
x = -18
x = -18
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