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x in (-oo:+oo)
2*(5-(4*x)) = -86 // + 86
2*(5-(4*x))+86 = 0
2*(5-4*x)+86 = 0
2*(5-4*x)+86 = 0
96-8*x = 0
96-8*x = 0
96-8*x = 0 // - 96
-8*x = -96 // : -8
x = -96/(-8)
x = 12
x = 12
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