Solve for a
a=12
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\left(1\times 4+3\right)a=84
Multiply both sides of the equation by 4.
\left(4+3\right)a=84
Multiply 1 and 4 to get 4.
7a=84
Add 4 and 3 to get 7.
a=\frac{84}{7}
Divide both sides by 7.
a=12
Divide 84 by 7 to get 12.
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