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-2a+14=5a+21
We simplify the equation to the form, which is simple to understand
-2a+14=5a+21
We move all terms containing a to the left and all other terms to the right.
-2a-5a=+21-14
We simplify left and right side of the equation.
-7a=+7
We divide both sides of the equation by -7 to get a.
a=-1
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