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21=11-6a
We simplify the equation to the form, which is simple to understand
21=11-6a
We move all terms containing a to the left and all other terms to the right.
+6a=+11-21
We simplify left and right side of the equation.
+6a=-10
We divide both sides of the equation by 06 to get a.
a=-1.66666666667
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