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a+a+10+a+15=225
We simplify the equation to the form, which is simple to understand
a+a+10+a+15=225
We move all terms containing a to the left and all other terms to the right.
+1a+1a+1a=+225-10-15
We simplify left and right side of the equation.
+3a=+200
We divide both sides of the equation by 3 to get a.
a=66.666666666667
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