Cara and Marcus shared a candy bar. The models are shaded to show the fraction of the candy bar each of them ate. What fraction of the candy bar did Cara and Marcus eat altogether?

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step-by-step explanation:

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or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!