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Addition is denoted by ‘+’, Subtraction is denoted by ‘-‘, Multiplication is denoted by ‘x’ and Division is denoted by ‘/’

= 5x -12y-5z +4z+11y+2x

Now we have to separate the like terms and writing them together, we will get the following

= 5x+2x-12y+11y-5z+4z

=7x-y-z

Therefore on solving (5x -12y-5z) + (4z+11y+2x), we get 7x-y-z.

2x/4 + 5x/4 = 3/4 + 5/4

Now we have to solve the right hand side, for this we need to take LCM on the right hand side

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

2x/4 + 5x/4 = (8)/4

2x/4 + 5x/4 = 2

Similarly we have to solve the left hand side by taking the LCM on left hand side

2x/4 + 5x/4 = 2

(2x+ 5x)/4 = 2

7x/4 = 2

We can rewrite this as,

7x/4 = 2/1

Now to solve the above equation, we have to cross multiply the above, then we will get

(7x) x 1= 2 x 4

7x = 8

Now to find out the value of x, we have to divide both sides of the equation by 7

7x/7 = 8/7

Therefore x = 8/7