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x in (-oo:+oo)
x/5 = 4*x-57 // - 4*x-57
x/5-(4*x)+57 = 0
x/5-4*x+57 = 0
57-19/5*x = 0 // - 57
-19/5*x = -57 // : -19/5
x = -57/(-19/5)
x = 15
x = 15
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