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x in (-oo:+oo)
6*x+4/5 = -7*x-(451/5) // + -7*x-(451/5)
6*x-(-7*x)+4/5+451/5 = 0
6*x+7*x+4/5+451/5 = 0
13*x+91 = 0 // - 91
13*x = -91 // : 13
x = -91/13
x = -7
x = -7
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