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x in (-oo:+oo)
x/4.3 = 6.9 // - 6.9
x/4.3-6.9 = 0
0.23255814*x-6.9 = 0 // + 6.9
0.23255814*x = 6.9 // : 0.23255814
x = 6.9/0.23255814
x = 29.66999994
x = 29.66999994
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