13=7a-3a-3

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Solution for 13=7a-3a-3 equation:


13=7a-3a-3

We simplify the equation to the form, which is simple to understand 
13=7a-3a-3

We move all terms containing a to the left and all other terms to the right. 
-7a+3a=-3-13

We simplify left and right side of the equation. 
-4a=-16

We divide both sides of the equation by -4 to get a. 
a=4

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