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a in (-oo:+oo)
a/3.5-8.8 = 6.3 // - 6.3
a/3.5-8.8-6.3 = 0
0.28571429*a-15.1 = 0 // + 15.1
0.28571429*a = 15.1 // : 0.28571429
a = 15.1/0.28571429
a = 52.84999921
a = 52.84999921
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