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3x-(x+7)=9

$3 x-(x+7)=9$

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Powers with negative bases

Full solution

Q.

3 x-(x+7)=9

Distribute negative sign: First, distribute the negative sign to both $x$ and $7$ inside the parentheses. $3x - x - 7 = 9$
Combine like terms: Now, combine like terms on the left side of the equation. $\newline$ $(3x - x) - 7 = 9$ $\newline$ $2x - 7 = 9$
Add $7$ to both sides: Next, add $7$ to both sides to isolate the term with $x$ . $\newline$ $2x - 7 + 7 = 9 + 7$ $\newline$ $2x = 16$
Divide by $2$ : Finally, divide both sides by $2$ to solve for x. $\newline$ $\frac{2x}{2} = \frac{16}{2}$ $\newline$ $x = 8$

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