Add the following expressions:

**1.**

(i) 5x+7x+(-6x) = 5x+7x-6x = (5+7-6)x = 6x

**(ii)** 3x/5 + 2x/3 + (-4x/5)

taking x as common

(3/5+2/3-4/5)x

(9+10-12)/15 x

7x/15

**(vii)** 5x-2x^{2}-8, 8x^{2}-7x-9, 3+7x^{2}-2x

5x-2x^{2}-8+8x^{2}-7x-9+3+7x^{2}-2x

13x^{2}-4x-14

Similarly you can do all the question