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2a+.5a=0
We simplify the equation to the form, which is simple to understand
2a+.5a=0
We move all terms containing a to the left and all other terms to the right.
+2a + 0.5a=0
We simplify left and right side of the equation.
+2.5a=0
We divide both sides of the equation by 2.5 to get a.
a=0
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