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.7-a=.5
We simplify the equation to the form, which is simple to understand
.7-a=.5
We move all terms containing a to the left and all other terms to the right.
-1a=0.5-0.7
We simplify left and right side of the equation.
-1a=-0.2
We divide both sides of the equation by -1 to get a.
a=0.2
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