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x in (-oo:+oo)
(-((2*x)/(-6))-5)^2 = 0
((1/3)*x-5)^2 = 0
(1/3*x-5)^2 = 0
1/3*x-5 = 0 // + 5
1/3*x = 5 // : 1/3
x = 5/1/3
x = 15
x in { 15, 15 }
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