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