3=-9(2)+b

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Solution for 3=-9(2)+b equation: 


Simplifying
3 = -9(2) + b

Multiply -9 * 2
3 = -18 + b

Solving
3 = -18 + 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 = -18 + b + -1b

Combine like terms: b + -1b = 0
3 + -1b = -18 + 0
3 + -1b = -18

Add '-3' to each side of the equation.
3 + -3 + -1b = -18 + -3

Combine like terms: 3 + -3 = 0
0 + -1b = -18 + -3
-1b = -18 + -3

Combine like terms: -18 + -3 = -21
-1b = -21

Divide each side by '-1'.
b = 21

Simplifying
b = 21

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