# Solving two-step linear equations using addition and subtraction: ax + b = c

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##### Examples
###### Lessons
1. Find x in the equation modelled by each diagram.

2. Find x in the equation modelled by algebra tiles.

3. Solve.
1. $7x + 9 = 21$
2. $98 - 2x = 14$
3. $- 35 = 6x + 49$
4. $- 4x - 11 = 109$
4. The total admission fee of an aquarium for 30 students is $240 after a group discount of$3 for each person. What is the original admission fee before the discount?
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##### Practice
###### Topic Notes
In this section, we will look at linear equation questions which involve two kinds of operations: addition and subtraction. We will deal with two-step linear equations modeled by diagrams as a start. Then, we will learn how to solve algebraic equations and related word problems.