Solution - Linear equations with one unknown
d=-9/13=-0.692
Step by Step Solution
Rearrange:
Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation : 
                     13*d-(-9)=0 
Step by step solution :
Step 1 :
Solving a Single Variable Equation :
 1.1      Solve  :    13d+9 = 0 
 Subtract  9  from both sides of the equation : 
                      13d = -9 
Divide both sides of the equation by 13:
                     d = -9/13 = -0.692 
One solution was found :
d = -9/13 = -0.692How did we do?
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