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a in (-oo:+oo)
4*a-2 = 38-6*a // - 38-6*a
4*a-(-6*a)-38-2 = 0
4*a+6*a-38-2 = 0
10*a-40 = 0 // + 40
10*a = 40 // : 10
a = 40/10
a = 4
a = 4
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