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a in (-oo:+oo)
(1/4)*a-(8*12) = 4 // - 4
(1/4)*a-(8*12)-4 = 0
(1/4)*a-96-4 = 0
1/4*a-100 = 0 // + 100
1/4*a = 100 // : 1/4
a = 100/1/4
a = 400
a = 400
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