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a in (-oo:+oo)
a/3.5-12 = -6.4 // + 6.4
a/3.5-12+6.4 = 0
0.28571429*a-5.6 = 0 // + 5.6
0.28571429*a = 5.6 // : 0.28571429
a = 5.6/0.28571429
a = 19.59999971
a = 19.59999971
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