7x-(-1)/-8=-4

Question

7x-(1)/8=-4

Answer 1

Be careful about using parenthesis to indicate whether it's:

7x - 1/8 = -4

or

(7x + 1)/-8 = -4

 

these yield two different answers. 

 

 

Answer 2

[(7x)-(-1)]/-8=

(7x+1)/-8=-4

7x+1=32 ... Cross multiplication

     -1   -1

(7x)/7=31/7

x=31/7

 

You can check this value for x by plugging it into the original equation

[7*(31/7)-(-1)]/-8

(31+1)/-8

32/-8=-4

-4=-4

 

Answer 3

7x - 1/8  = -4

 

get rid of the fraction by multiplying each term by 8:

 

56x - 1 = -32

 

add 1 to both sides to get:

 

56x = -31

 

divide both sides by 56 to get:

 

x = -31/56

 

Your Answer is, x = -31/56