### Home > CCA2 > Chapter 5 > Lesson 5.1.1 > Problem5-12

5-12.

Solve each of the following equations for $x$.

1. $\frac { x } { 3 } = \frac { 4 } { 5 }$

$x=\frac{12}{5}$

2. $\frac { x } { x + 1 } = \frac { 5 } { 7 }$

$x=\frac{5}{2}$

3. $\frac { 6 } { 15 } = 2 - \frac { x } { 5 }$

Multiply both sides of the equation by 15 and simplify each term.

Be sure you multiply each term, including $2$, by $15$.

$6=30−3x$

4. $\frac { 2 } { 3 } + \frac { x } { 5 } = 6$

What is the common denominator of $3\ \text{and}\ 5$?

See part (c).