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5a-2a-1a-15=0
We simplify the equation to the form, which is simple to understand
5a-2a-1a-15=0
We move all terms containing a to the left and all other terms to the right.
+5a-2a-1a=0+15
We simplify left and right side of the equation.
+2a=+15
We divide both sides of the equation by 2 to get a.
a=7.5
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