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L: 35 L: 35
A: 18 A: 18 + y
area: 630 +245 = area: 875
Simplemente
L. A = area
35 . (18 + y) = 875
630 + 35y = 875
35y = 245
y = 7
Rpta: En 7 cm
Espero haberte ayudado :v !