Solve for x: 8x - 3 = 5x + 15
Pick an answer
Correct!
Not quite. The correct answer is highlighted.
Correct answer to question 139 (Mathematics Knowledge): 6
Method
Gather the variables on one side: 8x - 5x = 15 + 3 gives 3x = 18, so x = 6.
Updated: November 2026
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