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x in (-oo:+oo)
(3/10)*x-(2/5) = -1 // + 1
(3/10)*x-(2/5)+1 = 0
(3/10)*x-2/5+1 = 0
3/10*x+3/5 = 0 // - 3/5
3/10*x = -3/5 // : 3/10
x = -3/5/3/10
x = -2
x = -2
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