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4a+13-a+7=7a+10+2-a
We simplify the equation to the form, which is simple to understand
4a+13-a+7=7a+10+2-a
We move all terms containing a to the left and all other terms to the right.
+4a-1a-7a+1a=+10+2-13-7
We simplify left and right side of the equation.
-3a=-8
We divide both sides of the equation by -3 to get a.
a=2.66666666667
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