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w in (-oo:+oo)
(-2/5)*w+4/5 = (-1/3)*w-7 // - (-1/3)*w-7
(-2/5)*w-((-1/3)*w)+4/5+7 = 0
(-2/5)*w+(1/3)*w+4/5+7 = 0
39/5-1/15*w = 0 // - 39/5
-1/15*w = -39/5 // : -1/15
w = -39/5/(-1/15)
w = 117
w = 117
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