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840=(2x+54)* (x+14)
840= 2x^2 + 28x+54x+756
840-756= 2x^2 + 82x
84 = 2x^2 + 82x
x=1
perimetro = 2b+2h
perimetro = 2*(2(1)+54) + 2*(1+14)
perimetro= 112+30= 142