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x in (-oo:+oo)
-3*x-(2/7) = 12 // - 12
-3*x-(2/7)-12 = 0
-3*x-2/7-12 = 0
-3*x-86/7 = 0 // + 86/7
-3*x = 86/7 // : -3
x = 86/7/(-3)
x = -86/21
x = -86/21
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