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x in (-oo:+oo)
x/4 = 12.4 // - 12.4
x/4-12.4 = 0
1/4*x-12.4 = 0 // + 12.4
1/4*x = 12.4 // : 1/4
x = 12.4/1/4
x = 49.6
x = 49.6
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