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y in (-oo:+oo)
2*y-((1/2)*y) = 6 // - 6
2*y-((1/2)*y)-6 = 0
2*y+(-1/2)*y-6 = 0
3/2*y-6 = 0 // + 6
3/2*y = 6 // : 3/2
y = 6/3/2
y = 4
y = 4
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