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b in (-oo:+oo)
b/2.2-1.8 = 7 // - 7
b/2.2-7-1.8 = 0
0.45454545*b-8.8 = 0 // + 8.8
0.45454545*b = 8.8 // : 0.45454545
b = 8.8/0.45454545
b = 19.36000019
b = 19.36000019
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