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a in (-oo:+oo)
(1/4)*a-4 = 7/4-3 // - 7/4-3
(1/4)*a-(7/4)-4+3 = 0
(1/4)*a-7/4-4+3 = 0
1/4*a-11/4 = 0 // + 11/4
1/4*a = 11/4 // : 1/4
a = 11/4/1/4
a = 11
a = 11
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