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w in (-oo:+oo)
(-7/6)*(w+6)-((1/3)*(2*w+21)) = 5-2 // - 5-2
(-7/6)*(w+6)-((1/3)*(2*w+21))-5+2 = 0
(-7/6)*(w+6)+(-1/3)*(2*w+21)-5+2 = 0
2-7/6*(w+6)-1/3*(2*w+21)-5 = 0
2-7/6*(w+6)-1/3*(2*w+21)-5 = 0
2-11/6*w-14-5 = 0
2-11/6*w-19 = 0
-11/6*w-17 = 0
-11/6*w-17 = 0
-11/6*w-17 = 0 // + 17
-11/6*w = 17 // : -11/6
w = 17/(-11/6)
w = -102/11
w = -102/11
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