Solve for Y
Y=10\left(P-20\right)
Solve for P
P=\frac{Y}{10}+20
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20+0.1Y=P
Swap sides so that all variable terms are on the left hand side.
0.1Y=P-20
Subtract 20 from both sides.
\frac{0.1Y}{0.1}=\frac{P-20}{0.1}
Multiply both sides by 10.
Y=\frac{P-20}{0.1}
Dividing by 0.1 undoes the multiplication by 0.1.
Y=10P-200
Divide P-20 by 0.1 by multiplying P-20 by the reciprocal of 0.1.
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