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w in (-oo:+oo)
5*w-(3/10) = -503/10 // + -503/10
5*w-(3/10)-(-503/10) = 0
5*w-3/10+503/10 = 0
5*w+50 = 0 // - 50
5*w = -50 // : 5
w = -50/5
w = -10
w = -10
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