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x in (-oo:+oo)
(-1/28)*x = 3/56 // - 3/56
(-1/28)*x-(3/56) = 0
(-1/28)*x-3/56 = 0
-1/28*x-3/56 = 0 // + 3/56
-1/28*x = 3/56 // : -1/28
x = 3/56/(-1/28)
x = -3/2
x = -3/2
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