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w in (-oo:+oo)
(2/5)*w = (1/3)*(w-9) // - (1/3)*(w-9)
(2/5)*w-((1/3)*(w-9)) = 0
(-1/3)*(w-9)+(2/5)*w = 0
(2*w)/5-1/3*(w-9) = 0
(-1/3*5*(w-9))/5+(2*w)/5 = 0
2*w-1/3*5*(w-9) = 0
1/3*w+15 = 0
(1/3*w+15)/5 = 0
(1/3*w+15)/5 = 0 // * 5
1/3*w+15 = 0
1/3*w+15 = 0 // - 15
1/3*w = -15 // : 1/3
w = -15/1/3
w = -45
w = -45
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