Simplify. \( 5 a+4 b-3 a= \) \( 6 x^{2}-8 x^{2}-5 x= \) \( x+7 x+5= \) \( 6 a b-8 a b+4 a b= \) \( 7 x-8 y-3 x+10 y= \) \( x^{2}+3 x+4+x^{2}+2 x-6= \) \( a+7-4+3 a+a-2 a= \) \( 6 a+4 b-3 c-6 b= \) \( 4 x^{3}-2 x\left(10 x^{2}-3 x^{2}\right)= \) \( (a+4 a)-2(6 a-10 a)= \) \( 5 x+7+3(x-7)= \)

Here are the simplified forms of the given expressions: 1. \(5a + 4b - 3a = 2a + 4b\) 2. \(6x^{2} - 8x^{2} - 5x = -2x^{2} - 5x\) 3. \(x + 7x + 5 = 8x + 5\) 4. \(6ab - 8ab + 4ab = 2ab\) 5. \(7x - 8y - 3x + 10y = 4x + 2y\) 6. \(x^{2} + 3x + 4 + x^{2} + 2x - 6 = 2x^{2} + 5x - 2\) 7. \(a + 7 - 4 + 3a + a - 2a = 3a + 3\) 8. \(6a + 4b - 3c - 6b = 6a - 2b - 3c\) 9. \(4x^{3} - 2x\left(10x^{2} - 3x^{2}\right) = 4x^{3} - 2x(7x^{2}) = 4x^{3} - 14x^{3} = -10x^{3}\) 10. \((a + 4a) - 2(6a - 10a) = 5a - 2(-4a) = 5a + 8a = 13a\) 11. \(5x + 7 + 3(x - 7) = 5x + 7 + 3x - 21 = 8x - 14\)