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250a+500a=7500
We simplify the equation to the form, which is simple to understand
250a+500a=7500
We move all terms containing a to the left and all other terms to the right.
+250a+500a=+7500
We simplify left and right side of the equation.
+750a=+7500
We divide both sides of the equation by 750 to get a.
a=10
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