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x in (-oo:+oo)
-16 = 8-5*x-(7*x) // - 8-5*x-(7*x)
7*x-(-5*x)-16-8 = 0
5*x+7*x-16-8 = 0
12*x-24 = 0 // + 24
12*x = 24 // : 12
x = 24/12
x = 2
x = 2
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