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w in (-oo:+oo)
(7*w+8)/3+(w+8)/2 = 18 // - 18
(7*w+8)/3+(w+8)/2-18 = 0
(2*(7*w+8))/(2*3)+(3*(w+8))/(2*3)+(-18*2*3)/(2*3) = 0
2*(7*w+8)+3*(w+8)-18*2*3 = 0
17*w-108+40 = 0
17*w-68 = 0
(17*w-68)/(2*3) = 0
(17*w-68)/(2*3) = 0 // * 2*3
17*w-68 = 0
17*w-68 = 0 // + 68
17*w = 68 // : 17
w = 68/17
w = 4
w = 4
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