Explicación paso a paso:
L+P=53
p=L+11
L+(L+11)=53
2L=42
L=21
p+21=53
p=32
Luis x
Pedro x + 11
x + x + 11
x + x + 11 = 53
x + x = 53 - 11
2 x = 42
x = 42/2
x = 21 La edad de Luis
Pedro x + 11 = 21 + 11 =32
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Explicación paso a paso:
L+P=53
p=L+11
L+(L+11)=53
2L=42
L=21
p+21=53
p=32
Luis x
Pedro x + 11
x + x + 11
x + x + 11 = 53
x + x = 53 - 11
2 x = 42
x = 42/2
x = 21 La edad de Luis
Pedro x + 11 = 21 + 11 =32