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y in (-oo:+oo)
10*(4/5) = (2/3)*y-4 // - (2/3)*y-4
10*(4/5)-((2/3)*y)+4 = 0
(-2/3)*y+10*(4/5)+4 = 0
12-2/3*y = 0 // - 12
-2/3*y = -12 // : -2/3
y = -12/(-2/3)
y = 18
y = 18
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