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w in (-oo:+oo)
7*w+9 = 129-3*w // - 129-3*w
7*w-(-3*w)-129+9 = 0
7*w+3*w-129+9 = 0
10*w-120 = 0 // + 120
10*w = 120 // : 10
w = 120/10
w = 12
w = 12
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