Hey there!
Firstly, we are going to divide by

on each of your sides because it paired off with a variable
Here's what I meant!

We would have to cancel out the:

because it gives us

Answer:

Good luck on your assignment and enjoy your day!
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Multiplying or dividing two related quantities by the same number is called scaling
35 pounds of black tea is needed to be mixed to get the final mixture for 2.10 per pound
<h3>What is an equation?</h3>
An equation is an expression that shows the relationship between two or more numbers and variables.
Let x represent the amount of black tea worth 1.80 per pound to be mixed to get the final mixture for 2.10 per pound, hence:
2.4(35) + 1.8(x) = 2.1(x + 35)
x = 35 pounds
35 pounds of black tea is needed to be mixed to get the final mixture for 2.10 per pound
Find out more on equation at: brainly.com/question/2972832
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