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a in (-oo:+oo)
2*a-((3*a)/2)-1 = 10 // - 10
2*a-((3*a)/2)-10-1 = 0
2*a+(-3/2)*a-10-1 = 0
1/2*a-11 = 0 // + 11
1/2*a = 11 // : 1/2
a = 11/1/2
a = 22
a = 22
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