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x in (-oo:+oo)
8 = 15-((1/3)*x) // - 15-((1/3)*x)
(1/3)*x-15+8 = 0
1/3*x-7 = 0 // + 7
1/3*x = 7 // : 1/3
x = 7/1/3
x = 21
x = 21
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