(x - 7)*(7 - x)
(x - 1*7)*(7 - x)
1*(x - 7)
2 -(-7 + x)
-(-7 + x)^2
(7.0 - x)*(-7.0 + x)
2 -49 - x + 14*x
-49 - x^2 + 14*x
2 -(7 - x)
-(7 - x)^2