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x in (-oo:+oo)
5 = -x/3 // + -x/3
5-(-x/3) = 0
(1/3)*x+5 = 0
1/3*x+5 = 0 // - 5
1/3*x = -5 // : 1/3
x = -5/1/3
x = -15
x = -15
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