1. Multiply a number by 4, then multiply this product by 5, then you get 80

Question

Whats the way to solve it, the equation.

2. Add 4 to a number, then subtract 5 from the sum, and you get 43

Whats the equation to solving that

if anyone can answer either of those,
that'd be great.

1. 4*X*5=20X=80
2. (x+4)-5=43