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13-7a=35-4a
We simplify the equation to the form, which is simple to understand
13-7a=35-4a
We move all terms containing a to the left and all other terms to the right.
-7a+4a=+35-13
We simplify left and right side of the equation.
-3a=+22
We divide both sides of the equation by -3 to get a.
a=-7.3333333333333
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