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x in (-oo:+oo)
x/5.12+7 = 9 // - 9
x/5.12-9+7 = 0
0.1953125*x-2 = 0 // + 2
0.1953125*x = 2 // : 0.1953125
x = 2/0.1953125
x = 10.24
x = 10.24
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