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8a+7=70+9
We simplify the equation to the form, which is simple to understand
8a+7=70+9
We move all terms containing a to the left and all other terms to the right.
+8a=+70+9-7
We simplify left and right side of the equation.
+8a=+72
We divide both sides of the equation by 8 to get a.
a=9
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