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x in (-oo:+oo)
(-1/3)*x+3 = -1 // + 1
(-1/3)*x+1+3 = 0
4-1/3*x = 0 // - 4
-1/3*x = -4 // : -1/3
x = -4/(-1/3)
x = 12
x = 12
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