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x in (-oo:+oo)
(-1/3)*(x-12) = 10 // - 10
(-1/3)*(x-12)-10 = 0
-1/3*(x-12)-10 = 0
-1/3*(x-12)-10 = 0
-1/3*x-6 = 0
-1/3*x-6 = 0
-1/3*x-6 = 0 // + 6
-1/3*x = 6 // : -1/3
x = 6/(-1/3)
x = -18
x = -18
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