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x in (-oo:+oo)
13-((4/2)*x) = 37 // - 37
13-((4/2)*x)-37 = 0
13-2*x-37 = 0
-2*x-24 = 0 // + 24
-2*x = 24 // : -2
x = 24/(-2)
x = -12
x = -12
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