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x²+15²=(x+5)²
x²+225=x²+10x+25
x²x²-10x=25-225
-10x=-200
x=-200/-10
x=20
b=15
c=x+5
a²+b²=c²
x²+15²=(x+5)²
x²+225=x²+10x+25
x²-x²+10x=225-25
10x=200
x=200/10
x=20