13=-13a-(-7a-3)

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


13=-13a-(-7a-3)

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

Remove unnecessary parentheses
13=-13a+7a+3

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

We simplify left and right side of the equation. 
+6a=-10

We divide both sides of the equation by 6 to get a. 
a=-1.66666666667

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