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x in (-oo:+oo)
x/4-8 = -4.9 // + 4.9
x/4-8+4.9 = 0
1/4*x-3.1 = 0 // + 3.1
1/4*x = 3.1 // : 1/4
x = 3.1/1/4
x = 12.4
x = 12.4
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