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a in (-oo:+oo)
2*a-3 = -3/2 // + -3/2
2*a-(-3/2)-3 = 0
2*a+3/2-3 = 0
2*a-3/2 = 0 // + 3/2
2*a = 3/2 // : 2
a = 3/2/2
a = 3/4
a = 3/4
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