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x in (-oo:+oo)
(-3/9)*x = 12/45 // - 12/45
(-3/9)*x-(12/45) = 0
(-3/9)*x-4/15 = 0
-1/3*x-4/15 = 0 // + 4/15
-1/3*x = 4/15 // : -1/3
x = 4/15/(-1/3)
x = -4/5
x = -4/5
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