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x in (-oo:+oo)
(2/5)*(7*x-1) = 3*x-1 // - 3*x-1
(2/5)*(7*x-1)-(3*x)+1 = 0
(2/5)*(7*x-1)-3*x+1 = 0
2/5*(7*x-1)-3*x+1 = 0
2/5*(7*x-1)-3*x+1 = 0
1-1/5*x-2/5 = 0
3/5-1/5*x = 0
3/5-1/5*x = 0
3/5-1/5*x = 0 // - 3/5
-1/5*x = -3/5 // : -1/5
x = -3/5/(-1/5)
x = 3
x = 3
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