-12=1(3)+b

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Solution for -12=1(3)+b equation:


Simplifying
-12 = 1(3) + b

Multiply 1 * 3
-12 = 3 + b

Solving
-12 = 3 + 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.
-12 + -1b = 3 + b + -1b

Combine like terms: b + -1b = 0
-12 + -1b = 3 + 0
-12 + -1b = 3

Add '12' to each side of the equation.
-12 + 12 + -1b = 3 + 12

Combine like terms: -12 + 12 = 0
0 + -1b = 3 + 12
-1b = 3 + 12

Combine like terms: 3 + 12 = 15
-1b = 15

Divide each side by '-1'.
b = -15

Simplifying
b = -15

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