Edward C. answered • 03/19/15

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You can combine terms if they have the same variables and powers

12f - 3f = (12-3)f = 9f

7.5g + 3.5g = (7.5+3.5)g = 11g

180h + 35j h and j are different variables so these terms cannot be combined

(3/4)k + (1/4)k = (4/4)k = k

7m + m = (7+1)m = 8m

5n + n = (5+1)n = 6n

You don't have to include the middle step where I used the distributive law to factor out the variable, I just wanted to include that extra step so you could see what's going on.