Solve for x
x=-\frac{x_{4}}{5}+280
Solve for x_4
x_{4}=1400-5x
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5x=1400-x_{4}
Subtract x_{4} from both sides.
\frac{5x}{5}=\frac{1400-x_{4}}{5}
Divide both sides by 5.
x=\frac{1400-x_{4}}{5}
Dividing by 5 undoes the multiplication by 5.
x=-\frac{x_{4}}{5}+280
Divide 1400-x_{4} by 5.
x_{4}=1400-5x
Subtract 5x from both sides.
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