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x-y=12
_______ +
2x=75
x=37,5
x-y=12
37,5-y=12
y=37,5-12
y=25,5
bil 2 = y
x + y = 63
x - y = 12
----------------(+)
2x = 75
x = 75/2
x = 37½
x + y = 63
37⅓ + y = 63
y = 63 - 37½
y = 25½