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w in (-oo:+oo)
36 = (7*w-4)/2+(9*w-2)/7 // - (7*w-4)/2+(9*w-2)/7
36-((7*w-4)/2)-((9*w-2)/7) = 0
(-1*(7*w-4))/2+(-1*(9*w-2))/7+36 = 0
(-1*7*(7*w-4))/(2*7)+(-1*2*(9*w-2))/(2*7)+(2*7*36)/(2*7) = 0
2*7*36-1*7*(7*w-4)-1*2*(9*w-2) = 0
32-67*w+504 = 0
536-67*w = 0
(536-67*w)/(2*7) = 0
(536-67*w)/(2*7) = 0 // * 2*7
536-67*w = 0
536-67*w = 0 // - 536
-67*w = -536 // : -67
w = -536/(-67)
w = 8
w = 8
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