1. Cross multiply: 4 * x + 18 = 7 * 28 Simplifying 4 * x + 18 = 7 * 28
2. Reorder the terms: 4 * 18 + x = 7 * 28 18 * 4 + x * 4 = 7 * 28 72 + 4x = 7 * 28
3. Multiply 7 * 28 72 + 4x = 196 Solving 72 + 4x = 196 Solving for variable 'x'.
4. Move all terms containing x to the left, all other terms to the right.
5. Add '-72' to each side of the equation. 72 + -72 + 4x = 196 + -72
6. Combine like terms: 72 + -72 = 0 0 + 4x = 196 + -72 4x = 196 + -72
7. Combine like terms: 196 + -72 = 124 4x = 124 Divide each side by '4'.
8.Simplifying x = 31
This should help you...