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w in (-oo:+oo)
(3/4)*w+9 = (3/7)*w+333/28 // - (3/7)*w+333/28
(3/4)*w-((3/7)*w)-(333/28)+9 = 0
(3/4)*w+(-3/7)*w-333/28+9 = 0
9/28*w-81/28 = 0 // + 81/28
9/28*w = 81/28 // : 9/28
w = 81/28/9/28
w = 9
w = 9
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