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w in (-oo:+oo)
6*w-((2/3)*w)+5/7 = -41/21 // + -41/21
6*w-((2/3)*w)+5/7-(-41/21) = 0
(-2/3)*w+6*w+5/7+41/21 = 0
16/3*w+8/3 = 0 // - 8/3
16/3*w = -8/3 // : 16/3
w = -8/3/16/3
w = -1/2
w = -1/2
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