After buying some new coins, Andre has 80 coins in his collection. Last month, he had 50 coins. The size of his current collection is what percentage of his collection last month?

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

I'm confused on this could anyone me and show me what i need to do to solve it.

2/3(-6y+9x) expand each expression using the distributive property