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a=-2; a-a+8
We simplify the equation to the form, which is simple to understand
a=-2;a-a+8
We move all terms containing a to the left and all other terms to the right.
+1a+2a+1a=+8
We simplify left and right side of the equation.
+4a=+8
We divide both sides of the equation by 4 to get a.
a=2
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