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a in (-oo:+oo)
a/2-((a-2)/4) = 7/4 // - 7/4
a/2-((a-2)/4)-(7/4) = 0
a/2-((a-2)/4)-7/4 = 0
(-1*(a-2))/4+a/2-7/4 = 0
(-1*2*(a-2))/(2*4)+(4*a)/(2*4)+(-7*2)/(2*4) = 0
4*a-1*2*(a-2)-7*2 = 0
2*a-14+4 = 0
2*a-10 = 0
(2*a-10)/(2*4) = 0
(2*a-10)/(2*4) = 0 // * 2*4
2*a-10 = 0
2*a-10 = 0 // + 10
2*a = 10 // : 2
a = 10/2
a = 5
a = 5
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