Ok...the fact that a decimal point got in there confuses me
(6g-3h)+(2g+5h) g=5 h=4
First replace all the letters with their respective numbers:
(6*5 - 3*4) + (2*5 + 5*4)
Then, do all multiplication. You are always supposed to do multiplication and division before addition and subtraction:
(30 - 12) + (10 + 20)
Then, do all math inside the parenthesis:
18 + 30
Finally, finish the problem:
48