Our solved equation: 3x + 4 = 19 · the answer is x = 5
Left side: 3x + 4
3×5 + 4
19
Right side
just the number
19
✓Both sides equal 19 — it balances. x = 5 checks out.
Try substituting a different value for x:x = 5
Verifying just means putting the answer back in and checking both sides come out the same. Slide x around — only the true solution makes the scale balance and earns the green tick.