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w in (-oo:+oo)
7*w+8 = -5*w-64 // + -5*w-64
7*w-(-5*w)+8+64 = 0
7*w+5*w+8+64 = 0
12*w+72 = 0 // - 72
12*w = -72 // : 12
w = -72/12
w = -6
w = -6
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