19 = 4.5x + 10.125((7.5 +x)/4.5) What do I do first?

First, let's divide the 10.125 by the 4.5 resulting in 2.25  ...so we have...

19 = 4.5x + 2.25(7.5 +x)

Next, mutiply by 100 to clear the decimals.....so we have...

1900 = 450x + 225(7.5 + x)

Can you take it drom there ????

Start whats in the parentheses so u would do 7.5+x