To solve the present problem, to each of the proportions given we will use the cross multiplication to help us to isolate X, as follows:
[tex]\begin{gathered} \frac{A}{B}=\frac{C}{X}\Rightarrow A\cdot X=B\cdot C \\ \\ \Rightarrow X=\frac{B\cdot C}{A} \end{gathered}[/tex]
Using this method, we solve each expression as follows:
1)
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