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w in (-oo:+oo)
2*(3*w+6) = 78 // - 78
2*(3*w+6)-78 = 0
2*(3*w+6)-78 = 0
6*w-66 = 0
6*w-66 = 0
6*w-66 = 0 // + 66
6*w = 66 // : 6
w = 66/6
w = 11
w = 11
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