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a*7=63
We simplify the equation to the form, which is simple to understand
a*7=63
Simplifying:
+7a=63
We move all terms containing a to the left and all other terms to the right.
+7a=+63
We simplify left and right side of the equation.
+7a=+63
We divide both sides of the equation by 7 to get a.
a=9
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