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X in (-oo:+oo)
(9/10)*X-(1/2) = 7 // - 7
(9/10)*X-(1/2)-7 = 0
(9/10)*X-1/2-7 = 0
9/10*X-15/2 = 0 // + 15/2
9/10*X = 15/2 // : 9/10
X = 15/2/9/10
X = 25/3
X = 25/3
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