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w in (-oo:+oo)
2*(3*w-9) = 36 // - 36
2*(3*w-9)-36 = 0
2*(3*w-9)-36 = 0
6*w-54 = 0
6*w-54 = 0
6*w-54 = 0 // + 54
6*w = 54 // : 6
w = 54/6
w = 9
w = 9
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