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erni = x kg
beti = x+2
B.
erni + beti = 76
x + x + 2 =76
2x = 76-2
x = 74/2
x = 37
erni = 37 kg
beti = 37 + 2 =39 kg
W erni X
B. X +2 + X = 76
2X + 2 += 76
2X = 76-2
2x = 74
X = 74: 2
X = 37
W beti +37 + 2 = 39
W erni +37