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w in (-oo:+oo)
3*w-13 = (1/4)*(52-(12*w)) // - (1/4)*(52-(12*w))
3*w-((1/4)*(52-(12*w)))-13 = 0
(-1/4)*(52-12*w)+3*w-13 = 0
3*w-1/4*(52-12*w)-13 = 0
3*w-1/4*(52-12*w)-13 = 0
6*w-13-13 = 0
6*w-26 = 0
6*w-26 = 0
6*w-26 = 0 // + 26
6*w = 26 // : 6
w = 26/6
w = 13/3
w = 13/3
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