book Maths Puzzle Numerical Ability

can you please help me with this equation. 5-4y+y-1=-23. Thank you sooo much!

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book Other Question

It says to complete by filling in the blank.

y^2 - 13y + 36 = (y - 4)(y-___)

x^2 +9x + 18 = (x+3)(x+ ____) OPEN-ENDED describe a situation that you can model with the equation: m divided by 5 = 4