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2a+7a=50
We simplify the equation to the form, which is simple to understand
2a+7a=50
We move all terms containing a to the left and all other terms to the right.
+2a+7a=+50
We simplify left and right side of the equation.
+9a=+50
We divide both sides of the equation by 9 to get a.
a=5.55555555556
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