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Klo slh mhon dimaafkan
mka x = y+15
x = y+15 disubtitusikan
x+ y = 157
y+15+y = 157
2y+15 = 157
2y = 157-15
y = 142/2
= 71
x = y+15 = 71+15 = 86
jadi skor roy = y = 71