Distribute: 3x + 12 = 21. 3x = 9. x = 3.

Solve for y: 4y - 7 = 2y + 9

4y - 2y = 9 + 7. 2y = 16. y = 8.

If 2x + 5 = 3x - 1, what is x?

5 + 1 = 3x - 2x. 6 = x. So x = 6.

x/4 = 7 - 3 = 4. x = 4 × 4 = 16.

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Solve for x: 5x - 3 = 22