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a in (-oo:+oo)
6 = (1*a)/4+2 // - (1*a)/4+2
6-((1*a)/4)-2 = 0
6-(a/4)-2 = 0
4-1/4*a = 0 // - 4
-1/4*a = -4 // : -1/4
a = -4/(-1/4)
a = 16
a = 16
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