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x in (-oo:+oo)
x/5+82 = 6.8 // - 6.8
x/5-6.8+82 = 0
1/5*x+75.2 = 0 // - 75.2
1/5*x = -75.2 // : 1/5
x = -75.2/1/5
x = -376
x = -376
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