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x in (-oo:+oo)
(-2/3)*x+4 = 12 // - 12
(-2/3)*x-12+4 = 0
-2/3*x-8 = 0 // + 8
-2/3*x = 8 // : -2/3
x = 8/(-2/3)
x = -12
x = -12
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