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w in (-oo:+oo)
5*w+1 = -13/7 // + -13/7
5*w-(-13/7)+1 = 0
5*w+13/7+1 = 0
5*w+20/7 = 0 // - 20/7
5*w = -20/7 // : 5
w = -20/7/5
w = -4/7
w = -4/7
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