For x you simplify both sides of the equation, then isolate the variable
X= 3/2
I think this may help you. If not go in the internet.
Answer:
The base of the ladder is 2.58 m.
Step-by-step explanation:
Given that,
The angle of elevation for a ladder from the ground is 75°.
The length of a ladder, H = 10 foot
We need to find the distance from the house should you place the base of the latter. Let the base of the ladder is b. Using trigonometry,

So, the base of the ladder is 2.58 m.
Step-by-step explanation:

To solve for a variable means to ISOLATE the variable on one side of the equation. To do so, divide both sides by the coefficient of y.
Look:
2y/2 = (-x+7)/2
Answer: y = (-x + 7)/2
The answer can also be written as
y = -(x/2) + (7/2)
Both answers mean the same thing.