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18=6-4a+4
We simplify the equation to the form, which is simple to understand
18=6-4a+4
We move all terms containing a to the left and all other terms to the right.
+4a=+6+4-18
We simplify left and right side of the equation.
+4a=-8
We divide both sides of the equation by 04 to get a.
a=-2
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