Expression or Equation?

 $15+15=25+5$  

• expression

• equation

 $4\times7$  

• equation

• expression

 $h+23$  

• expression

• equation

 $18t-5z^4$  

• Expression

• Equation

 $13x^5$  

• Expression

• Equation

 $12x^2-8x+14=0$  

• Expression

• Equation

 $9=9$  

• Expression

• Equation

 $2x+7x+13=0$  

• Equation

• Expression

 $3p+5$  

• Equation

• Expression

 $9x+2$  

• Equation

• Expression