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a+2+3+4+2a-1=13
We simplify the equation to the form, which is simple to understand
a+2+3+4+2a-1=13
We move all terms containing a to the left and all other terms to the right.
+1a+2a=+13-2-3-4+1
We simplify left and right side of the equation.
+3a=+5
We divide both sides of the equation by 3 to get a.
a=1.6666666666667
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