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x in (-oo:+oo)
13/20-(1/4) = x-(8/5) // - x-(8/5)
13/20-x-(1/4)+8/5 = 0
13/20-x-1/4+8/5 = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x = 2
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