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x in (-oo:+oo)
x+x+8/5 = 78 // - 78
x+x+8/5-78 = 0
2*x-382/5 = 0 // + 382/5
2*x = 382/5 // : 2
x = 382/5/2
x = 191/5
x = 191/5
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