exam Maths Puzzle Numerical Ability

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Solve by the addition method

5x -3y= -20
3x + 2y= 7

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exam Other Question

I need help to solve this problem seems I can get the right answer
Solve
3(x - 2) + 7x = 8x + 0
Find the LCM of s^2-16 and s^2+6s+8.