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x in (-oo:+oo)
(3/10)*x = 3/4 // - 3/4
(3/10)*x-(3/4) = 0
(3/10)*x-3/4 = 0
3/10*x-3/4 = 0 // + 3/4
3/10*x = 3/4 // : 3/10
x = 3/4/3/10
x = 5/2
x = 5/2
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