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a in (-oo:+oo)
(3/4)*a+1/2 = 33/4-7*a // - 33/4-7*a
(3/4)*a-(-7*a)+1/2-(33/4) = 0
(3/4)*a+7*a+1/2-33/4 = 0
31/4*a-31/4 = 0 // + 31/4
31/4*a = 31/4 // : 31/4
a = 31/4/31/4
a = 1
a = 1
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