Solving equation 8 * x * (1 / 2) = (21-x) * 7 * (1 / 2)

Solving equation 8 * x * (1 / 2) = (21-x) * 7 * (1 / 2)

8*X*(1\2)=(21-X)*7*(1\2)
Double two on both sides
8X=21*7-7X
8X+7X=147
15X=147
X=147÷15
X=9.8