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w in (-oo:+oo)
415/28 = 6*w+(3/7)*w+10 // - 6*w+(3/7)*w+10
415/28-(6*w)-((3/7)*w)-10 = 0
(-3/7)*w-6*w+415/28-10 = 0
135/28-45/7*w = 0 // - 135/28
-45/7*w = -135/28 // : -45/7
w = -135/28/(-45/7)
w = 3/4
w = 3/4
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