exam Maths Puzzle Numerical Ability

6x + 4(3x - 2) = 6x + 2

I am getting x=10 but I was not sure if I did it right.

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exam Other Question

if you have 15 counters and sort them into 4 piles, after that the next number of counters is increased by 5. Clue- Pile one is 4 more than Pile two. Pile two is one less than pile A 25-foot ladder leaning against a building touches the wall 18 feet above the ground. How far from the building is the bottom of the ladder? Help please. Thank you