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c²=a²+b²
(x+5)²=x²+15²
x²+10x+25=x²+225
10x=x²-x²+225-25
10x=200
x=200/10
x=20
Jadi Nilai x=20
x²+15²=(x+5)²
x²+225=x²+10x+25
10x=200
x=20