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28+2a=+7
We simplify the equation to the form, which is simple to understand
28+2a=+7
We move all terms containing a to the left and all other terms to the right.
+2a=+7-28
We simplify left and right side of the equation.
+2a=-21
We divide both sides of the equation by 2 to get a.
a=-10.5
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