Question

-(18+4x)=8 hope you can help

Answer 1

-1(18+4x)=8
Then you distribute
-18-4x=8
-4x=26
X= -6.5

Answer 2

Because there is a negative sign in front of the parentheses, you have to make all the signs in the parentheses the opposite:
-18 - 4x = 8   Then you can add -4x to the other side to make it positive and then subtract 8 to the other side to work on getting x all by itself. 
-18 - 8 = 4x   Then add your two negatives (because you add negatives when you have two of them because you are kind of making the answer more negative in a way :/ ) to get -26:
-26 = 4x   Then divide by 4 to simplify and get x all by itself which leaves you with:
-6.5 = x (because when you divide a negative by a positive the quotient is negative) Check your answer by substituting -6.5 in for x in the original equation:
-[18 + 4(-6.5)] = 8   Multiply 4 times -6.5 (because you always start with the innermost parentheses) to get -26:
-(18 - 26) = 8   Change the signs because of the negative in the front:
-18 + 26 = 8    Subtract -18 from 26 to get 8
8 = 8  Correct!    So your answer is x = -6.5!