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a-8.7=-6.1
We simplify the equation to the form, which is simple to understand
a-8.7=-6.1
We move all terms containing a to the left and all other terms to the right.
+1a=-6.1+8.7
We simplify left and right side of the equation.
+1a=+2.6
We divide both sides of the equation by 1 to get a.
a=2.6
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