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x in (-oo:+oo)
(-1/3)*(x+1) = 3 // - 3
(-1/3)*(x+1)-3 = 0
-1/3*(x+1)-3 = 0
-1/3*(x+1)-3 = 0
-1/3*x-10/3 = 0
-1/3*x-10/3 = 0
-1/3*x-10/3 = 0 // + 10/3
-1/3*x = 10/3 // : -1/3
x = 10/3/(-1/3)
x = -10
x = -10
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