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a+a+1+a+2=72
We simplify the equation to the form, which is simple to understand
a+a+1+a+2=72
We move all terms containing a to the left and all other terms to the right.
+1a+1a+1a=+72-1-2
We simplify left and right side of the equation.
+3a=+69
We divide both sides of the equation by 3 to get a.
a=23
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