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x in (-oo:+oo)
7 = (1/3)*x-8 // - (1/3)*x-8
7-((1/3)*x)+8 = 0
(-1/3)*x+7+8 = 0
15-1/3*x = 0 // - 15
-1/3*x = -15 // : -1/3
x = -15/(-1/3)
x = 45
x = 45
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