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x in (-oo:+oo)
1/2-(45*x) = 225 // - 225
1/2-(45*x)-225 = 0
1/2-45*x-225 = 0
-45*x-449/2 = 0 // + 449/2
-45*x = 449/2 // : -45
x = 449/2/(-45)
x = -449/90
x = -449/90
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