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x in (-oo:+oo)
2/5-6*x = 242/5 // - 242/5
2/5-6*x-(242/5) = 0
2/5-6*x-242/5 = 0
-6*x-48 = 0 // + 48
-6*x = 48 // : -6
x = 48/(-6)
x = -8
x = -8
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