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x in (-oo:+oo)
-2*x-10 = 8-4*x // - 8-4*x
-2*x-(-4*x)-10-8 = 0
4*x-2*x-10-8 = 0
2*x-18 = 0 // + 18
2*x = 18 // : 2
x = 18/2
x = 9
x = 9
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