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x in (-oo:+oo)
(3/10)*x = -12/45 // + -12/45
(3/10)*x-(-12/45) = 0
(3/10)*x+4/15 = 0
3/10*x+4/15 = 0 // - 4/15
3/10*x = -4/15 // : 3/10
x = -4/15/3/10
x = -8/9
x = -8/9
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