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x in (-oo:+oo)
x/4.2 = -18.9 // + 18.9
x/4.2+18.9 = 0
0.23809524*x+18.9 = 0 // - 18.9
0.23809524*x = -18.9 // : 0.23809524
x = -18.9/0.23809524
x = -79.37999936
x = -79.37999936
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