log(2,x) = log(4 ,x + y + 2) https://www.wolframalpha.com/input?i=log%282%2Cx%29+%3D+log%284+%2Cx+%2B+y+%2B+2%29&lang=ja
log(2,x) = log(4 ,x + y + 2)
https://www.wolframalpha.com/input?i=log%282%2Cx%29+%3D+log%284+%2Cx+%2B+y+%2B+2%29&lang=ja