Here's one way of solving this problem:
Plant 1 has 28 cars, x of which will be sent to dealership A, and the rest,
28-x, will be sent to dealership B.
Transportation cost for Plant 1 to Dealerships A and B will be 220(x) + 300(28-x)
Plant 2 has 8 cars, y of which will be sent...

1. s + 4t = r, solve for s
Your goal is to get s = something, so isolate the s! Right now, your s is followed by "+ 4t."
To get s by itself, you want to get rid of 4t from the left-hand-side of your equation.
To that end, subtract 4t from each side of the equation...

You take the same approach as with simplifying other rational expressions like... fractions!
Simplifying 15/6 is a no-brainer for most algebra students.
One method is to break up both the numerator and denominator into factors.
--> (3*5)/(2*3)
Obviously, you would cancel...