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x in (-oo:+oo)
0.5*(x/30) = 0.7 // - 0.7
0.5*(x/30)-0.7 = 0
0.016666665*x-0.7 = 0 // + 0.7
0.016666665*x = 0.7 // : 0.016666665
x = 0.7/0.016666665
x = 42.0000042
x = 42.0000042
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