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x in (-oo:+oo)
7/10-(4/5) = x-(3/2) // - x-(3/2)
7/10-x-(4/5)+3/2 = 0
7/10-x-4/5+3/2 = 0
7/5-x = 0 // - 7/5
-x = -7/5 // * -1
x = 7/5
x = 7/5
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