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x in (-oo:+oo)
x/10 = x-2.25 // - x-2.25
x/10-x+2.25 = 0
2.25-9/10*x = 0 // - 2.25
-9/10*x = -2.25 // : -9/10
x = -2.25/(-9/10)
x = 2.5
x = 2.5
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