Answer:
Explanation:
you want to set the equation equal to 0
-5x - 21 = 0
add 21 to both sides to get the variable by itself
-5x = 21
divide both sides by -5
x = - 21/5
The value of x = -21/5
=> -5x-21 =0
=> -21 = 5x
=> -21/5 = x
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