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21=2(x-5)
We move all terms to the left:
21-(2(x-5))=0
We calculate terms in parentheses: -(2(x-5)), so:We get rid of parentheses
2(x-5)
We multiply parentheses
2x-10
Back to the equation:
-(2x-10)
-2x+10+21=0
We add all the numbers together, and all the variables
-2x+31=0
We move all terms containing x to the left, all other terms to the right
-2x=-31
x=-31/-2
x=15+1/2
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