Basic Math Examples

$a - 9 = - 9 + a$

Step 1

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

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Step 1.1

Subtract $a$ from both sides of the equation.

$a - 9 - a = - 9$

Step 1.2

Combine the opposite terms in $a - 9 - a$ .

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Step 1.2.1

Subtract $a$ from $a$ .

$0 - 9 = - 9$

Step 1.2.2

Subtract $9$ from $0$ .

$- 9 = - 9$

Step 2

Since $- 9 = - 9$ , the equation will always be true for any value of $a$ .

All real numbers

Step 3

The result can be shown in multiple forms.

All real numbers

Interval Notation:

$(- \infty, \infty)$