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donde x es el lado igual
x + x + 2x+20 = 140
4x = 120
x = 30m
el lado distinto mide:
2x+20
2(30)+20
=80 m
llamaremos l=lado igual(son 2 lados iguales)
2l+b=140
b=2l+20
sustituimos en la primera ecuacion b=2l+20
2l+b=140
2l+2l+20=140
4l+20=140
4l=140-20
4l=120
l=120/4
l=30