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

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3 Answers

[(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
 
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