I did not even read this because im too very lazy but it is prolly easy so can you help me please its due today
Which of the following is true about this mathematical statement: 2x + 9 = 7 + x ?
A.It is an equation because it has an equal sign.
B.It is an equation because it has the variable x.
C.It is an expression because it has an equal sign.
D.This is an equation because it has a mathematical operation sign.