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x in (-oo:+oo)
7/10-x = 6/5 // - 6/5
7/10-x-(6/5) = 0
7/10-x-6/5 = 0
-x-1/2 = 0 // + 1/2
-x = 1/2 // * -1
x = -1/2
x = -1/2
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