Pre-Algebra Examples

$21 x - 6 - 13 x = 2 (4 x - 4) + 2$

Step 1

Subtract $13 x$ from $21 x$ .

$8 x - 6 = 2 (4 x - 4) + 2$

Step 2

Simplify $2 (4 x - 4) + 2$ .

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Step 2.1

Simplify each term.

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Step 2.1.1

Apply the distributive property.

$8 x - 6 = 2 (4 x) + 2 \cdot - 4 + 2$

Step 2.1.2

Multiply $4$ by $2$ .

$8 x - 6 = 8 x + 2 \cdot - 4 + 2$

Step 2.1.3

Multiply $2$ by $- 4$ .

$8 x - 6 = 8 x - 8 + 2$

Step 2.2

Add $- 8$ and $2$ .

$8 x - 6 = 8 x - 6$

Step 3

Move all terms containing $x$ to the left side of the equation.

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Step 3.1

Subtract $8 x$ from both sides of the equation.

$8 x - 6 - 8 x = - 6$

Step 3.2

Combine the opposite terms in $8 x - 6 - 8 x$ .

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Step 3.2.1

Subtract $8 x$ from $8 x$ .

$0 - 6 = - 6$

Step 3.2.2

Subtract $6$ from $0$ .

$- 6 = - 6$

Step 4

Since $- 6 = - 6$ , the equation will always be true.

Always true