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x in (-oo:+oo)
x = 4/5-25*4-25+7 // - 4/5-25*4-25+7
x-(4/5)-(-25*4)-7+25 = 0
x-4/5-7+25+100 = 0
x+586/5 = 0 // - 586/5
x = -586/5
x = -586/5
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