exam Maths Puzzle Numerical Ability

I need help to solve this problem seems I can get the right answer
Solve
3(x - 2) + 7x = 8x + 0

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exam Other Question

6. Solve using the quadratic formula:
x^2 – 5x – 1 = -7
It is 2:07 AM and I am fried. Please help.

Solve by the addition method

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