6²-x²=5²-(5-x)²

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6²-x²=5²-(5-x)²6²-x²=5²-(5-x)²6²-x²=5²-(5-x)&

6²-x²=5²-(5-x)²
6²-x²=5²-(5-x)²

6²-x²=5²-(5-x)²
36-x^2=25-(x^2-10x+25)
36-x^2=-x^2+10x
36=10x
x=3.6

x=3.6

36-x^2=25-25+10x-x^2
10x=36
x=18/5

36-x²=25-(25-10x+x²)