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x in (-oo:+oo)
x+3 = -5*x-57 // + -5*x-57
x-(-5*x)+3+57 = 0
x+5*x+3+57 = 0
6*x+60 = 0 // - 60
6*x = -60 // : 6
x = -60/6
x = -10
x = -10
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