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x in (-oo:+oo)
x/4-2.1 = -14.9 // + 14.9
x/4-2.1+14.9 = 0
1/4*x+12.8 = 0 // - 12.8
1/4*x = -12.8 // : 1/4
x = -12.8/1/4
x = -51.2
x = -51.2
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