Respuesta :

(5x+17)+129+94+(7x-46)+(9x-11)=540

5x+7x+9x+17+129+94-46-11=540

21x+146+94-57=540

21x+240-57=540

21x+183=540

     -183 -183

21x=357

/21  /21

x=17

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hope it helps