300=4(-400)+b

Solution for 300=4(-400)+b equation:

Simplifying
300 = 4(-400) + b

Multiply 4 * -400
300 = -1600 + b

Solving
300 = -1600 + b

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '-1b' to each side of the equation.
300 + -1b = -1600 + b + -1b

Combine like terms: b + -1b = 0
300 + -1b = -1600 + 0
300 + -1b = -1600

Add '-300' to each side of the equation.
300 + -300 + -1b = -1600 + -300

Combine like terms: 300 + -300 = 0
0 + -1b = -1600 + -300
-1b = -1600 + -300

Combine like terms: -1600 + -300 = -1900
-1b = -1900

Divide each side by '-1'.
b = 1900

Simplifying
b = 1900