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a-.13=-.58
We simplify the equation to the form, which is simple to understand
a-.13=-.58
We move all terms containing a to the left and all other terms to the right.
+1a=-0.58 + 0.13
We simplify left and right side of the equation.
+1a=-0.45
We divide both sides of the equation by 1 to get a.
a=-0.45
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