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w in (-oo:+oo)
(-2/3)*(w-49) = -4/5 // + -4/5
(-2/3)*(w-49)-(-4/5) = 0
(-2/3)*(w-49)+4/5 = 0
4/5-2/3*(w-49) = 0
(-2/3*5*(w-49))/5+4/5 = 0
4-2/3*5*(w-49) = 0
502/3-10/3*w = 0
(502/3-10/3*w)/5 = 0
(502/3-10/3*w)/5 = 0 // * 5
502/3-10/3*w = 0
502/3-10/3*w = 0 // - 502/3
-10/3*w = -502/3 // : -10/3
w = -502/3/(-10/3)
w = 251/5
w = 251/5
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