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-18+7a=-2a+3+4
We simplify the equation to the form, which is simple to understand
-18+7a=-2a+3+4
We move all terms containing a to the left and all other terms to the right.
+7a+2a=+3+4+18
We simplify left and right side of the equation.
+9a=+25
We divide both sides of the equation by 9 to get a.
a=2.77777777778
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