Answer:

Step-by-step explanation:
Let's solve:

Step 1: Simplify both sides of the equation.

Step 2: Add 3x to both sides.

Step 3: Subtract 4 from both sides.

Step 4: Divide both sides by -1.

Therefore, the answer will be x = 4.
I think the answer is 12.8 mm
4n+15=70+n
I'm pretty sure this is the answer
Have a good day!