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4a+2a+7=25
We simplify the equation to the form, which is simple to understand
4a+2a+7=25
We move all terms containing a to the left and all other terms to the right.
+4a+2a=+25-7
We simplify left and right side of the equation.
+6a=+18
We divide both sides of the equation by 6 to get a.
a=3
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