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13=-7a-56-6a+4
We simplify the equation to the form, which is simple to understand
13=-7a-56-6a+4
We move all terms containing a to the left and all other terms to the right.
+7a+6a=-56+4-13
We simplify left and right side of the equation.
+13a=-65
We divide both sides of the equation by 13 to get a.
a=-5
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