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Area primer rectángulo: (X)8 = 8X
Area segundo rectángulo: (X)15 = 15X
15X - 8X = 35
7X = 35
X = 35/7
X = 5
Altura 5 dm
Probemos
Area 1: 8x5 = 40 dm²
Area 2: 15x5 = 75 dm²
75 - 40 = 35 dm²
Rta: La altura es igual a 5 dm
A=b*h
A+35=b*h
b*h+35=b*h
reemplazamos
8*h+35=15*h
8h+35=15h
8h-15h=-35
-7h=-35
h=-35/-7
h=5
la altura es igual a 5dm