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2+4=3a
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 12a, the least common multiple of 6a,3a,4.
6=3a
Add 2 and 4 to get 6.
3a=6
Swap sides so that all variable terms are on the left hand side.
a=\frac{6}{3}
Divide both sides by 3.
a=2
Divide 6 by 3 to get 2.