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2+1-6a=-4
We simplify the equation to the form, which is simple to understand
2+1-6a=-4
We move all terms containing a to the left and all other terms to the right.
-6a=-4-2-1
We simplify left and right side of the equation.
-6a=-7
We divide both sides of the equation by -6 to get a.
a=1.16666666667
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