Attempt following question by selecting a choice to answer.
f
Solve
2x = 21 - x.f fA.
f7
B.
f10
C.
f5
D.
f6
f
A
Step 1: [Original equation.]
2x = 21 - x
Step 2: [Add x to both sides.]3x = 21
Step 3: [Divide each side by 3.]
3x3 = 213
Step 4: [Simplify.]x = 7
Step 5: The solution of the equation is x = 7.