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w in (-oo:+oo)
6*(5*w+6) = 186 // - 186
6*(5*w+6)-186 = 0
6*(5*w+6)-186 = 0
30*w-150 = 0
30*w-150 = 0
30*w-150 = 0 // + 150
30*w = 150 // : 30
w = 150/30
w = 5
w = 5
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