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w in (-oo:+oo)
300 = (1/5)*(w-(5*10)) // - (1/5)*(w-(5*10))
300-((1/5)*(w-(5*10))) = 0
(-1/5)*(w-50)+300 = 0
300-1/5*(w-50) = 0
300-1/5*(w-50) = 0
310-1/5*w = 0
310-1/5*w = 0
310-1/5*w = 0 // - 310
-1/5*w = -310 // : -1/5
w = -310/(-1/5)
w = 1550
w = 1550
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