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x in (-oo:+oo)
1-x-(4*x) = 31 // - 31
1-x-(4*x)-31 = 0
1-x-4*x-31 = 0
-5*x-30 = 0 // + 30
-5*x = 30 // : -5
x = 30/(-5)
x = -6
x = -6
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