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x in (-oo:+oo)
X-x+2/2-(7/10) = 9/10 // - 9/10
X-x+2/2-(7/10)-(9/10) = 0
X-x+2/2-7/10-9/10 = 0
X-x-3/5 = 0 // - X-3/5
-x = -(X-3/5) // * -1
x = X-3/5
x = X-3/5
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