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w in (-oo:+oo)
7*w+3 = -6/5 // + -6/5
7*w-(-6/5)+3 = 0
7*w+6/5+3 = 0
7*w+21/5 = 0 // - 21/5
7*w = -21/5 // : 7
w = -21/5/7
w = -3/5
w = -3/5
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