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\begin{align*}
&P=100\text{ psia} \ \ \rightarrow \ \ K_1=5.4, \ K_2=1.9, \ K_3=0.61 \ \
&P=130\text{ psia} \ \ \rightarrow \ \ K_1=4.4, \ K_2=1.52 , \ K_3=0.48 \ \
\end{align*}
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\begin{align}
(a+b)^2 &= (a+b)(a+b) \\
&= a^2+2ab+b^2
\end{align}
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\begin{align*}
x&=y & w &=z & a&=b+c\\
2x&=-y & 3w&=\frac{1}{2}z & a&=b\\
-4 + 5x&=2+y & w+2&=-1+w & ab&=cb
\end{align*}