To add expressions where many different variables are used, be sure to remember like terms. Like terms are terms which have the same variable bases and exponents. For instance a and b are different bases but ab and ab are the same. a^2b and ab^2 are different bases while a^2b^2 and a^2b^2 are the same. Both the variable and the exponents must be the same.
In this expression, there is 1 variable with the same exponent. x should be combined with x and constants with constants.
(x/2-7x+6)+(x/2+6x)
x/2 + x/2 - 7x + 6x = x - 7x + 6x = 0x
6
The simplified expression is 0x + 6 which is just 7=6.
