Worked Example 1
Solve 4x − 7 = 21.
Read what was done to x×4 first, then −7
Undo the subtraction4x = 28
Undo the multiplicationx = 7
Check4(7) − 7 = 21 ✓
Worked Example 2
Solve 5x − 3 = 2x + 9.
Get the x terms together3x − 3 = 9
Now it is the familiar shape3x = 12
Finish the jobx = 4
Check both sides separatelyLeft 17, right 17 ✓
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