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7-10=9-9a
We simplify the equation to the form, which is simple to understand
7-10=9-9a
We move all terms containing a to the left and all other terms to the right.
+9a=+9-7+10
We simplify left and right side of the equation.
+9a=+12
We divide both sides of the equation by 09 to get a.
a=1.3333333333333
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