Explanation:
This is an equation, where we need to find the value of x.
To solve this equation, we can first use the distributive property to expand 3.4(x + 7) which gives 3.4x + 3.4 * 7 = 3.4x + 23.8
Now we have the equation:
3.4x + 23.8 - 2.1 = 35.5
Next, we can add 2.1 to both sides of the equation:
3.4x + 23.8 = 37.6
Then, we can subtract 23.8 from both sides of the equation:
3.4x = 13.8
Finally, we can divide both sides of the equation by 3.4 to find the value of x:
x = 4
Therefore, the value of x that solves the equation is 4.