You'll have to use the distributive property, which means you multiply the number outside of the parenthesis. This makes the equation 20+2x-8. Then you sub in whatever is equal to x and solve.
Hope this helps :)
12+2x
Explanation:
1. distribute
2(10)= 2*10
2(x-4)= 2x-8
2. combine like terms
20-8 =12
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