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w in (-oo:+oo)
6*(5*w-8) = 42 // - 42
6*(5*w-8)-42 = 0
6*(5*w-8)-42 = 0
30*w-90 = 0
30*w-90 = 0
30*w-90 = 0 // + 90
30*w = 90 // : 30
w = 90/30
w = 3
w = 3
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