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X in (-oo:+oo)
(1/5)*(2*X-6) = 3 // - 3
(1/5)*(2*X-6)-3 = 0
1/5*(2*X-6)-3 = 0
1/5*(2*X-6)-3 = 0
2/5*X-21/5 = 0
2/5*X-21/5 = 0
2/5*X-21/5 = 0 // + 21/5
2/5*X = 21/5 // : 2/5
X = 21/5/2/5
X = 21/2
X = 21/2
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