-1=.5*2+b

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Solution for -1=.5*2+b equation:


Simplifying
-1 = 0.5 * 2 + b

Multiply 0.5 * 2
-1 = 1 + b

Solving
-1 = 1 + 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.
-1 + -1b = 1 + b + -1b

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

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

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

Combine like terms: 1 + 1 = 2
-1b = 2

Divide each side by '-1'.
b = -2

Simplifying
b = -2

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