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(24/7)*((39/8)*a-1) = -87 // + 87
(24/7)*((39/8)*a-1)+87 = 0
24/7*(39/8*a-1)+87 = 0
24/7*(39/8*a-1)+87 = 0
117/7*a+585/7 = 0
117/7*a+585/7 = 0
117/7*a+585/7 = 0 // - 585/7
117/7*a = -585/7 // : 117/7
a = -585/7/117/7
a = -5
a = -5
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