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y in (-oo:+oo)
4 = (5*y)/10-3 // - (5*y)/10-3
3-((5*y)/10)+4 = 0
(-1/2)*y+3+4 = 0
7-1/2*y = 0 // - 7
-1/2*y = -7 // : -1/2
y = -7/(-1/2)
y = 14
y = 14
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