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x in (-oo:+oo)
(-3/10)*x = 2 // - 2
(-3/10)*x-2 = 0
-3/10*x-2 = 0 // + 2
-3/10*x = 2 // : -3/10
x = 2/(-3/10)
x = -20/3
x = -20/3
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