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a in (-oo:+oo)
7*a-((1/2)*a)+10 = 93/8 // - 93/8
7*a-((1/2)*a)-(93/8)+10 = 0
7*a+(-1/2)*a-93/8+10 = 0
13/2*a-13/8 = 0 // + 13/8
13/2*a = 13/8 // : 13/2
a = 13/8/13/2
a = 1/4
a = 1/4
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