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w in (-oo:+oo)
3*(5*w+6) = 153 // - 153
3*(5*w+6)-153 = 0
3*(5*w+6)-153 = 0
15*w-135 = 0
15*w-135 = 0
15*w-135 = 0 // + 135
15*w = 135 // : 15
w = 135/15
w = 9
w = 9
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