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x in (-oo:+oo)
(3/10)*x-(1/5) = 1 // - 1
(3/10)*x-(1/5)-1 = 0
(3/10)*x-1/5-1 = 0
3/10*x-6/5 = 0 // + 6/5
3/10*x = 6/5 // : 3/10
x = 6/5/3/10
x = 4
x = 4
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