book Maths Puzzle Numerical Ability

How do I solve this problem 4(x-6)-7((x-2)=17

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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 I'm having trouble with a homework problem can you please help.

Let the supply and demand function for ice cream be given by

p= s(p) = 2/5q and p=D(q) = 100-2/5q

Where