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a^2 +b^2 = c^2
(x+1)^2+12^2=(x+7)^2
144=12x+48
12x=96
x=8
sisi miring= 8+7=15
X*14X+49=X*+2X+1+144
14X+49=2X+1+144
12X=96
X=8
Jadi,pnjng sisi miringnya adalah 8+7=15cm