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