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3x-7=180. 3x+4=180
3x=187. 3x=176
x=3/187. x=176/3
x=62.3 x=58.6
Seria 62.3+58.6=120.9
(3x-7)(3x+4)
9x^2+12x-21x-28
9x^2-9x-28
Espero haberte ayudado saludos