\{ 5 x - 3 y = 21
Solve for x
x=\frac{3\left(y+7\right)}{5}
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5x=21+3y
Add 3y to both sides.
5x=3y+21
The equation is in standard form.
\frac{5x}{5}=\frac{3y+21}{5}
Divide both sides by 5.
x=\frac{3y+21}{5}
Dividing by 5 undoes the multiplication by 5.
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