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-7-(5a)=28
We simplify the equation to the form, which is simple to understand
-7-(5a)=28
Remove unnecessary parentheses
-7-5a=28
We move all terms containing a to the left and all other terms to the right.
-5a=+28+7
We simplify left and right side of the equation.
-5a=+35
We divide both sides of the equation by -5 to get a.
a=-7
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