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w in (-oo:+oo)
2*(6*w+3) = 90 // - 90
2*(6*w+3)-90 = 0
2*(6*w+3)-90 = 0
12*w-84 = 0
12*w-84 = 0
12*w-84 = 0 // + 84
12*w = 84 // : 12
w = 84/12
w = 7
w = 7
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