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a in (-oo:+oo)
(1/6)*a-2.1 = 3.6 // - 3.6
(1/6)*a-3.6-2.1 = 0
1/6*a-5.7 = 0 // + 5.7
1/6*a = 5.7 // : 1/6
a = 5.7/1/6
a = 34.19999932
a = 34.19999932
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