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x in (-oo:+oo)
x/4.2 = 11.7 // - 11.7
x/4.2-11.7 = 0
0.23809524*x-11.7 = 0 // + 11.7
0.23809524*x = 11.7 // : 0.23809524
x = 11.7/0.23809524
x = 49.13999961
x = 49.13999961
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