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Pedro : 2x 2x + 8
-------------
suma: 3x + 16 = 46
x = 10
entonces...
Susana: 1*10 = 10
Pedro: 2*10 = 20
X+8+y+8=46
X+8+2x+8=46
2x+X=46-8-8
3x=30
X=30 dividido entre 3 y X es igual a 10 y ahí haces
y= 2×10
y la incógnita y da 20