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2x+20 = 180
2x = 180-20
2x = 160
x = 160/2
x = 80
(x+5)²=x²+15²
x²+10x+25=x²+225
x²-x²+10x=225-25
10x=200
x=200/10
x=20
x+5=20+5=25
sisi-sisi segitiga 15,20,25
jadi x=20cm