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x in (-oo:+oo)
x/7.8 = -54.3 // + 54.3
x/7.8+54.3 = 0
0.12820513*x+54.3 = 0 // - 54.3
0.12820513*x = -54.3 // : 0.12820513
x = -54.3/0.12820513
x = -423.53999407
x = -423.53999407
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