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a in (-oo:+oo)
(1/14)*(a+5) = (1/4)*(2-a) // - (1/4)*(2-a)
(1/14)*(a+5)-((1/4)*(2-a)) = 0
(1/14)*(a+5)+(-1/4)*(2-a) = 0
1/14*(a+5)-1/4*(2-a) = 0
1/14*(a+5)-1/4*(2-a) = 0
9/28*a-1/7 = 0
9/28*a-1/7 = 0
9/28*a-1/7 = 0 // + 1/7
9/28*a = 1/7 // : 9/28
a = 1/7/9/28
a = 4/9
a = 4/9
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