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(x+7)(2x-3)=84
2x²+11x-21=84
2 x² + 11 x - 105 = 0
por la formula general
x = (-11+-√(121-4(2)(-105)) /(2(2)) = 5
sustituyendo x
lados = 12 cm y 7 cm
perímetro = 2 x (12+7) = 38 cm