a 10-a+12+3a= 15 y+2x+3y-10= 16 -7x+2-3x-2=

Let's simplify each expression step by step:<br /><br />---<br /><br />### **14. \( 10 - a + 12 + 3a \):**<br /><br />1. Combine like terms:<br /> - Constants: \( 10 + 12 = 22 \)<br /> - Variables: \( -a + 3a = 2a \)<br /><br />2. Final simplified expression:<br /> \[<br /> 22 + 2a<br /> \]<br /><br />---<br /><br />### **15. \( y + 2x + 3y - 10 \):**<br /><br />1. Combine like terms:<br /> - Variables with \( y \): \( y + 3y = 4y \)<br /> - Variables with \( x \): \( 2x \) (no other \( x \)-terms to combine)<br /> - Constant: \( -10 \)<br /><br />2. Final simplified expression:<br /> \[<br /> 4y + 2x - 10<br /> \]<br /><br />---<br /><br />### **16. \( -7x + 2 - 3x - 2 \):**<br /><br />1. Combine like terms:<br /> - Variables with \( x \): \( -7x - 3x = -10x \)<br /> - Constants: \( 2 - 2 = 0 \)<br /><br />2. Final simplified expression:<br /> \[<br /> -10x<br /> \]<br /><br />---<br /><br />### Final Answers:<br />- **14:** \( 22 + 2a \)<br />- **15:** \( 4y + 2x - 10 \)<br />- **16:** \( -10x \)