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x in (-oo:+oo)
(-1/3)*x+2 = -4 // + 4
(-1/3)*x+2+4 = 0
6-1/3*x = 0 // - 6
-1/3*x = -6 // : -1/3
x = -6/(-1/3)
x = 18
x = 18
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