exam Maths Puzzle Numerical Ability

Please help me solve this problem 2b^2+13b-7

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exam Other Question

Problem:

Solve for y:
-2x + 4y = 8x + 12

Thanks for helping. 10b^4/11v^2 * 121v^5/100b=
Ok I get 1210b^4v^5/1100v^2b
Now what?