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39.99+.45a=44.99+.40a
We simplify the equation to the form, which is simple to understand
39.99+.45a=44.99+.40a
We move all terms containing a to the left and all other terms to the right.
+ 0.45a-0.4a=+44.99-39.99
We simplify left and right side of the equation.
+ 0.05a=+5
We divide both sides of the equation by 0.05 to get a.
a=100
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