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x in (-oo:+oo)
(3/10)*x+1/5 = 9/10 // - 9/10
(3/10)*x+1/5-(9/10) = 0
(3/10)*x+1/5-9/10 = 0
3/10*x-7/10 = 0 // + 7/10
3/10*x = 7/10 // : 3/10
x = 7/10/3/10
x = 7/3
x = 7/3
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