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-7a-9=6
We simplify the equation to the form, which is simple to understand
-7a-9=6
We move all terms containing a to the left and all other terms to the right.
-7a=+6+9
We simplify left and right side of the equation.
-7a=+15
We divide both sides of the equation by -7 to get a.
a=-2.14285714286
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