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w in (-oo:+oo)
5*w-51.25 = (3/4)*w-13 // - (3/4)*w-13
5*w-((3/4)*w)-51.25+13 = 0
5*w+(-3/4)*w-51.25+13 = 0
17/4*w-38.25 = 0 // + 38.25
17/4*w = 38.25 // : 17/4
w = 38.25/17/4
w = 9
w = 9
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