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w in (-oo:+oo)
(6*w-8)/7+(5*w-8)/2 = 15 // - 15
(6*w-8)/7+(5*w-8)/2-15 = 0
(2*(6*w-8))/(2*7)+(7*(5*w-8))/(2*7)+(-15*2*7)/(2*7) = 0
2*(6*w-8)+7*(5*w-8)-15*2*7 = 0
47*w-210-72 = 0
47*w-282 = 0
(47*w-282)/(2*7) = 0
(47*w-282)/(2*7) = 0 // * 2*7
47*w-282 = 0
47*w-282 = 0 // + 282
47*w = 282 // : 47
w = 282/47
w = 6
w = 6
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