Solve for A
\left\{\begin{matrix}A=\frac{3x}{4R}\text{, }&x\neq 0\text{ and }R\neq 0\\A\neq 0\text{, }&R=0\text{ and }x=0\end{matrix}\right.
Solve for R
R=\frac{3x}{4A}
A\neq 0
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R\times 20A=15x
Variable A cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 20A.
20AR=15x
Reorder the terms.
20RA=15x
The equation is in standard form.
\frac{20RA}{20R}=\frac{15x}{20R}
Divide both sides by 20R.
A=\frac{15x}{20R}
Dividing by 20R undoes the multiplication by 20R.
A=\frac{3x}{4R}
Divide 15x by 20R.
A=\frac{3x}{4R}\text{, }A\neq 0
Variable A cannot be equal to 0.
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