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x in (-oo:+oo)
(1/5)*(10-(5*(x-2))) = 0
(1/5)*(10-5*(x-2)) = 0
1/5*(10-5*(x-2)) = 0
10-5*(x-2) = 0
10-5*(x-2) = 0
20-5*x = 0
20-5*x = 0
1/5*(20-5*x) = 0
20-5*x = 0 // - 20
-5*x = -20 // : -5
x = -20/(-5)
x = 4
x = 4
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