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29+4.50a=42.50
We simplify the equation to the form, which is simple to understand
29+4.50a=42.50
We move all terms containing a to the left and all other terms to the right.
+4.5a=+42.5-29
We simplify left and right side of the equation.
+4.5a=+13.5
We divide both sides of the equation by 4.5 to get a.
a=3
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