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-5a+9=-4
We simplify the equation to the form, which is simple to understand
-5a+9=-4
We move all terms containing a to the left and all other terms to the right.
-5a=-4-9
We simplify left and right side of the equation.
-5a=-13
We divide both sides of the equation by -5 to get a.
a=2.6
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