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w in (-oo:+oo)
(-1/5)*(w+5)-((1/4)*(5*w+16)) = 4/5 // - 4/5
(-1/5)*(w+5)-((1/4)*(5*w+16))-(4/5) = 0
(-1/5)*(w+5)+(-1/4)*(5*w+16)-4/5 = 0
-1/5*(w+5)-1/4*(5*w+16)-4/5 = 0
(-1/5*5*(w+5))/5+(-1/4*5*(5*w+16))/5-4/5 = 0
-1/5*5*(w+5)-1/4*5*(5*w+16)-4 = 0
-29/4*w-25-4 = 0
-29/4*w-29 = 0
(-29/4*w-29)/5 = 0
(-29/4*w-29)/5 = 0 // * 5
-29/4*w-29 = 0
-29/4*w-29 = 0 // + 29
-29/4*w = 29 // : -29/4
w = 29/(-29/4)
w = -4
w = -4
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