Solve for a
a=3
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4\times 3=4a
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 4a.
12=4a
Multiply 4 and 3 to get 12.
4a=12
Swap sides so that all variable terms are on the left hand side.
a=\frac{12}{4}
Divide both sides by 4.
a=3
Divide 12 by 4 to get 3.
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