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x in (-oo:+oo)
7-((5/3)*x) = 15 // - 15
7-((5/3)*x)-15 = 0
(-5/3)*x-15+7 = 0
-5/3*x-8 = 0 // + 8
-5/3*x = 8 // : -5/3
x = 8/(-5/3)
x = -24/5
x = -24/5
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