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bilangan kecil = y
x - y = 25
2x - y = 175------di sustitusi ajah
2x - (-x -25) = 175
2x + x + 25 = 175
3x = 150
x = 50
x-y = 25
50 -y = 25
y = 25
bilangan besar = 50
bilangan kecil 25