Solve for a
a=12
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84=7a
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by a.
7a=84
Swap sides so that all variable terms are on the left hand side.
a=\frac{84}{7}
Divide both sides by 7.
a=12
Divide 84 by 7 to get 12.
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