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x in (-oo:+oo)
(-1/3)*x+2 = 12 // - 12
(-1/3)*x-12+2 = 0
-1/3*x-10 = 0 // + 10
-1/3*x = 10 // : -1/3
x = 10/(-1/3)
x = -30
x = -30
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