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a in (-oo:+oo)
a/2.2 = -4.13 // + 4.13
a/2.2+4.13 = 0
0.45454545*a+4.13 = 0 // - 4.13
0.45454545*a = -4.13 // : 0.45454545
a = -4.13/0.45454545
a = -9.08600009
a = -9.08600009
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