book Maths Puzzle Numerical Ability

1. 7(x-1)+5=-2(3-4x)+5
2. 2(3-z)=16-2(3+2z)
3. 8y-3(4-2y)=6(y+1)-2
4. 3+7(x+1)=6-(5+2x)
5. 7(a-1)+4=-(2a-4)+6a+2
6. -2(3-4z)+7z=13z-4
7. -4(2x-5)+3x=x-28
8. 5-(x+8)+6x=4(x+2

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book Other Question

Three times the first of two numbers decreased by the second number equals 9. Twice the first number increased by the second number equals 11. Find the two numbers. I need a system of equations to solve the problem. I have two problems i need help with. I need to solve these by using the quadratic equation.

1: 3x^2 - 2x = 15x - 0

2: x^2 - 3x - 23 = 5

Any help would be greatly appreciated