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b = bilangan kecil
a - b = 25
a = 25 + b
2a - b = 175
2 ( 25 + b ) - b = 175
50 + 2b - b = 175
b = 125
a = 25 + b
a = 25 + 125
a = 150
x - y = 25 150 - y = 25
------------------ - y = 125
x = 150
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