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x in (-oo:+oo)
(1/5)*(2*x-2) = 8 // - 8
(1/5)*(2*x-2)-8 = 0
1/5*(2*x-2)-8 = 0
1/5*(2*x-2)-8 = 0
2/5*x-42/5 = 0
2/5*x-42/5 = 0
2/5*x-42/5 = 0 // + 42/5
2/5*x = 42/5 // : 2/5
x = 42/5/2/5
x = 21
x = 21
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