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w in (-oo:+oo)
(2/3)*(w-12)+(5/9)*w+7/9 = 5*w+10 // - 5*w+10
(2/3)*(w-12)+(5/9)*w-(5*w)+7/9-10 = 0
(2/3)*(w-12)+(5/9)*w-5*w+7/9-10 = 0
2/3*(w-12)+(5*w)/9-5*w+7/9-10 = 0
(2/3*9*(w-12))/9+(5*w)/9+(-5*9*w)/9+7/9+(-10*9)/9 = 0
2/3*9*(w-12)+5*w-5*9*w-10*9+7 = 0
11*w-45*w-90-72+7 = 0
7-34*w-90-72 = 0
-34*w-90-65 = 0
-34*w-155 = 0
(-34*w-155)/9 = 0
(-34*w-155)/9 = 0 // * 9
-34*w-155 = 0
-34*w-155 = 0 // + 155
-34*w = 155 // : -34
w = 155/(-34)
w = -155/34
w = -155/34
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