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x in (-oo:+oo)
(-71/2)*x = 51/4 // - 51/4
(-71/2)*x-(51/4) = 0
(-71/2)*x-51/4 = 0
-71/2*x-51/4 = 0 // + 51/4
-71/2*x = 51/4 // : -71/2
x = 51/4/(-71/2)
x = -51/142
x = -51/142
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