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4a-13=18
We simplify the equation to the form, which is simple to understand
4a-13=18
We move all terms containing a to the left and all other terms to the right.
+4a=+18+13
We simplify left and right side of the equation.
+4a=+31
We divide both sides of the equation by 4 to get a.
a=7.75
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