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x in (-oo:+oo)
x-(9/(2^2)) = -7/4 // + -7/4
x-(9/(2^2))-(-7/4) = 0
x-9*2^-2+7/4 = 0
x-1/2 = 0 // + 1/2
x = 1/2
x = 1/2
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