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x in (-oo:+oo)
x+3/4 = 2*x-(3/10) // - 2*x-(3/10)
x-(2*x)+3/4+3/10 = 0
x-2*x+3/4+3/10 = 0
21/20-x = 0 // - 21/20
-x = -21/20 // * -1
x = 21/20
x = 21/20
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