When solving an equation, Anne's first step is shown below. Which property justifies Anne's first step? \text{Original Equation:}
Original Equation:
7x^2+(8x^2+1) =
7x
2
+(8x
2
+1)=
\,\, 6x^2-5
6x
2
−5
\text{First Step:}
First Step:
15x^2+1 =
15x
2
+1=
\,\, 6x^2-5
6x
2
−5