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.5a-3=7
We simplify the equation to the form, which is simple to understand
.5a-3=7
We move all terms containing a to the left and all other terms to the right.
+ 0.5a=+7+3
We simplify left and right side of the equation.
+ 0.5a=+10
We divide both sides of the equation by 0.5 to get a.
a=20
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