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x in (-oo:+oo)
(9/10)*x-(1/2) = 2 // - 2
(9/10)*x-(1/2)-2 = 0
(9/10)*x-1/2-2 = 0
9/10*x-5/2 = 0 // + 5/2
9/10*x = 5/2 // : 9/10
x = 5/2/9/10
x = 25/9
x = 25/9
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