Since is on the right side of the equation, switch the sides so it is on the left side of the equation.

Simplify each term.

Apply the distributive property.

Multiply by .

Add and .

Subtract from both sides of the equation.

Combine the opposite terms in .

Subtract from .

Subtract from .

Since , the equation will always be true for any value of .

All real numbers

The result can be shown in multiple forms.

All real numbers

Interval Notation:

Solve for t 9t-21=3(t-7)+6t