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y in (-oo:+oo)
y = (2/3)*y+80 // - (2/3)*y+80
y-((2/3)*y)-80 = 0
y+(-2/3)*y-80 = 0
1/3*y-80 = 0 // + 80
1/3*y = 80 // : 1/3
y = 80/1/3
y = 240
y = 240
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