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x in (-oo:+oo)
1-5*x = 2*x+57 // - 2*x+57
1-5*x-(2*x)-57 = 0
1-5*x-2*x-57 = 0
-7*x-56 = 0 // + 56
-7*x = 56 // : -7
x = 56/(-7)
x = -8
x = -8
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