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x in (-oo:+oo)
(x-3)/3 = -4.5 // + 4.5
(x-3)/3+4.5 = 0
(x-3)/3+(3*4.5)/3 = 0
x+3*4.5-3 = 0
x+10.5 = 0
(x+10.5)/3 = 0
(x+10.5)/3 = 0 // * 3
x+10.5 = 0
x+10.5 = 0 // - 10.5
x = -10.5
x = -10.5
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