First, do distributive property:
2(5+3x)+(x+10) Distribute the 2 to the 5 and the 3x; multiply them
10+6x+x+10 Since (x+10) would be 1 times x and 10, it's just x+10
Then, do communitive property:
10+6x+x+10 What we found in the last step, now combine the like terms
20+7x This is what you get since 10+10=20 and 6x+x=7x
The answer:
20+7x or 7x+20
Hope that helps!