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x in (-oo:+oo)
(-5*x)/10 = 51/10 // - 51/10
(-5*x)/10-(51/10) = 0
(-5*x)/10-51/10 = 0
-1/2*x-51/10 = 0 // + 51/10
-1/2*x = 51/10 // : -1/2
x = 51/10/(-1/2)
x = -51/5
x = -51/5
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