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2a+2a+1+12=30
We simplify the equation to the form, which is simple to understand
2a+2a+1+12=30
We move all terms containing a to the left and all other terms to the right.
+2a+2a=+30-1-12
We simplify left and right side of the equation.
+4a=+17
We divide both sides of the equation by 4 to get a.
a=4.25
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