3=-2(-2)+b

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Solution for 3=-2(-2)+b equation:


Simplifying
3 = -2(-2) + b

Multiply -2 * -2
3 = 4 + b

Solving
3 = 4 + 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.
3 + -1b = 4 + b + -1b

Combine like terms: b + -1b = 0
3 + -1b = 4 + 0
3 + -1b = 4

Add '-3' to each side of the equation.
3 + -3 + -1b = 4 + -3

Combine like terms: 3 + -3 = 0
0 + -1b = 4 + -3
-1b = 4 + -3

Combine like terms: 4 + -3 = 1
-1b = 1

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

Simplifying
b = -1

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