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w in (-oo:+oo)
(2*w)/3+6 = (1/3)*w+15 // - (1/3)*w+15
(2*w)/3-((1/3)*w)-15+6 = 0
(2*w)/3+(-1/3)*w-15+6 = 0
1/3*w-9 = 0 // + 9
1/3*w = 9 // : 1/3
w = 9/1/3
w = 27
w = 27
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