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If 7x-9=4x+12, what is the value of x?

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ABCD

Where 1 comes from

The solution reaches this line too.

Where \frac{21}{11} comes from

This line moves to the left as . It differs from the solution, where it becomes .

Solution

Where 21 comes from

The solution reaches this line too.

Algebra

Linear equations in one variable

Linear equations in two variables

Linear functions

Systems of two linear equations

Linear inequalities

Advanced Math

Equivalent expressions

Nonlinear equations and systems

Nonlinear functions

Problem-Solving and Data Analysis

Ratios, rates, proportions and units

Percentages

One-variable data

Two-variable data

Probability and conditional probability

Inference from sample statistics

Geometry and Trigonometry

Area and volume

Lines, angles and triangles

Right triangles and trigonometry

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Treat wrong answers right.