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x in (-oo:+oo)
(-1/3)*x-(1/4) = 1 // - 1
(-1/3)*x-(1/4)-1 = 0
(-1/3)*x-1/4-1 = 0
-1/3*x-5/4 = 0 // + 5/4
-1/3*x = 5/4 // : -1/3
x = 5/4/(-1/3)
x = -15/4
x = -15/4
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