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a in (-oo:+oo)
2*a-2 = (5*a+1)/4 // - (5*a+1)/4
2*a-((5*a+1)/4)-2 = 0
(-1*(5*a+1))/4+2*a-2 = 0
(-1*(5*a+1))/4+(2*4*a)/4+(-2*4)/4 = 0
2*4*a-1*(5*a+1)-2*4 = 0
3*a-8-1 = 0
3*a-9 = 0
(3*a-9)/4 = 0
(3*a-9)/4 = 0 // * 4
3*a-9 = 0
3*a-9 = 0 // + 9
3*a = 9 // : 3
a = 9/3
a = 3
a = 3
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