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