exam Maths Puzzle Numerical Ability

ok i dont know what categorey it goes in.. but i need help on changing trinomials into binomials.

I am a visual learner so please show me how to convert them.

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exam Other Question

a supply company wants to build a new office. they have budgeted monthly payments of $26,000 for 25 years at 7.8% interest compounded monthly. how much can the company afford to I need help on the following problem:

The difference when 7 less than a number is subtracted from twice the number is 12. What is the number?

I have no clue as to how to set up this equation. Please help!

thanks!