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x in (-oo:+oo)
2*x-(7/4) = -7 // + 7
2*x-(7/4)+7 = 0
2*x-7/4+7 = 0
2*x+21/4 = 0 // - 21/4
2*x = -21/4 // : 2
x = -21/4/2
x = -21/8
x = -21/8
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