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x in (-oo:+oo)
9*x-(7/4) = -8 // + 8
9*x-(7/4)+8 = 0
9*x-7/4+8 = 0
9*x+25/4 = 0 // - 25/4
9*x = -25/4 // : 9
x = -25/4/9
x = -25/36
x = -25/36
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