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w in (-oo:+oo)
(1/2)*w-(7/5) = (-2/5)*w-4 // - (-2/5)*w-4
(1/2)*w-((-2/5)*w)-(7/5)+4 = 0
(1/2)*w+(2/5)*w-7/5+4 = 0
9/10*w+13/5 = 0 // - 13/5
9/10*w = -13/5 // : 9/10
w = -13/5/9/10
w = -26/9
w = -26/9
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