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x in (-oo:+oo)
(1/3)*x+5 = 9/12 // - 9/12
(1/3)*x-(9/12)+5 = 0
(1/3)*x-3/4+5 = 0
1/3*x+17/4 = 0 // - 17/4
1/3*x = -17/4 // : 1/3
x = -17/4/1/3
x = -51/4
x = -51/4
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