9=.8(-3)+b

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Solution for 9=.8(-3)+b equation: 


Simplifying
9 = 0.8(-3) + b

Multiply 0.8 * -3
9 = -2.4 + b

Solving
9 = -2.4 + 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.
9 + -1b = -2.4 + b + -1b

Combine like terms: b + -1b = 0
9 + -1b = -2.4 + 0
9 + -1b = -2.4

Add '-9' to each side of the equation.
9 + -9 + -1b = -2.4 + -9

Combine like terms: 9 + -9 = 0
0 + -1b = -2.4 + -9
-1b = -2.4 + -9

Combine like terms: -2.4 + -9 = -11.4
-1b = -11.4

Divide each side by '-1'.
b = 11.4

Simplifying
b = 11.4

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