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x in (-oo:+oo)
-3.75 = (1/3)*x // - (1/3)*x
-((1/3)*x)-3.75 = 0
(-1/3)*x-3.75 = 0
-1/3*x-3.75 = 0 // + 3.75
-1/3*x = 3.75 // : -1/3
x = 3.75/(-1/3)
x = -11.25000011
x = -11.25000011
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