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y in (-oo:+oo)
(-1/2)*y-8+5 = 3*y-2 // - 3*y-2
(-1/2)*y-(3*y)-8+2+5 = 0
(-1/2)*y-3*y-8+2+5 = 0
-7/2*y-1 = 0 // + 1
-7/2*y = 1 // : -7/2
y = 1/(-7/2)
y = -2/7
y = -2/7
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