X=31, the other post justifies, I just wanted to make it more accessible for if someone just needs the answer :)
(5rs-1t3)(-3r2st)
-30r^2s^2t+18rst^2
First you need to set up your equation.
If you read the question it states one equation IS THE SAME AMOUNT of another equation so here it is:
3x+7= 2x+18
You want to find out x in both equations so I’ll help step by step
1. Subtract 2x from both sides
This leaves you with x+7=18
2. Then subtract 7 on both sides
This leaves you with x=11
So x equals 11 for equations.
You can check by plugging in 11 in x. If you get 40 on both sides....
CONGRATS!! You did it
I hope this helped. Have a great day!
3rd one is correct as it satisfies the eqaution