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y in (-oo:+oo)
2 = (10*y)/20 // - (10*y)/20
2-((10*y)/20) = 0
(-1/2)*y+2 = 0
2-1/2*y = 0 // - 2
-1/2*y = -2 // : -1/2
y = -2/(-1/2)
y = 4
y = 4
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