book Maths Puzzle Numerical Ability

1. 2X + 5 = 17

2. 2X + 3X - 5 = 25

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book Other Question

two numbers differ by 18. Four times the smaller is 57 more than the larger. Find the numbers. Hi, I'm having trouble with this question. I understand how to determine whether a map is linear by using gauss elimination but I don't know what matrix to use.

Q: State wheter