exam Maths Puzzle Numerical Ability

Please solve the equation. 5(2q-1)=5+10q.

Thanks for all of your help!

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exam Other Question

x-1 divided by x+1 + x+7 divided by x-1 = 4 divided by x^2-1

and

2x+3 divided by 3x-2 = 4x+1 divided by 6x+1

Thank you! How does one prove: If C is an infinite set and B is a finite set, the CB is an infinite set? I can do the proof if B = null set, but I get lost if B intersects C. If B has n e