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x in (-oo:+oo)
1/5-2*x = 5*x+211/5 // - 5*x+211/5
1/5-2*x-(5*x)-(211/5) = 0
1/5-2*x-5*x-211/5 = 0
-7*x-42 = 0 // + 42
-7*x = 42 // : -7
x = 42/(-7)
x = -6
x = -6
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