Trigonometry Examples

$- 3 x - 3 = - 21$

Step 1

Move all terms not containing $x$ to the right side of the equation.

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Step 1.1

Add $3$ to both sides of the equation.

$- 3 x = - 21 + 3$

Step 1.2

Add $- 21$ and $3$ .

$- 3 x = - 18$

Step 2

Divide each term in $- 3 x = - 18$ by $- 3$ and simplify.

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Step 2.1

Divide each term in $- 3 x = - 18$ by $- 3$ .

$\frac{- 3 x}{- 3} = \frac{- 18}{- 3}$

Step 2.2

Simplify the left side.

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Step 2.2.1

Cancel the common factor of $- 3$ .

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Step 2.2.1.1

Cancel the common factor.

$\frac{- 3 x}{- 3} = \frac{- 18}{- 3}$

Step 2.2.1.2

Divide $x$ by $1$ .

$x = \frac{- 18}{- 3}$

Step 2.3

Simplify the right side.

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Step 2.3.1

Divide $- 18$ by $- 3$ .

$x = 6$