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a in (-oo:+oo)
644 = (12*a-200)/12 // - (12*a-200)/12
644-((12*a-200)/12) = 0
(-1*(12*a-200))/12+644 = 0
(-1*(12*a-200))/12+(12*644)/12 = 0
12*644-1*(12*a-200) = 0
7928-12*a = 0
(7928-12*a)/12 = 0
(7928-12*a)/12 = 0 // * 12
7928-12*a = 0
7928-12*a = 0 // - 7928
-12*a = -7928 // : -12
a = -7928/(-12)
a = 1982/3
a = 1982/3
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