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$8x + (3 + 7x)$

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Add and subtract polynomials

Full solution

Q.

8x + (3 + 7x)

Combine terms: Combine the terms inside the parentheses. $\newline$ $8x + (3 + 7x) = 8x + 3 + 7x$
Group like terms: Group the like terms. $\newline$ $8x + 3 + 7x = (8x + 7x) + 3$
Add like terms: Add the like terms. $\newline$ $(8x + 7x) + 3 = 15x + 3$

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