-2(21-b)+3(b-4)=

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Solution for -2(21-b)+3(b-4)= equation:


Simplifying
-2(21 + -1b) + 3(b + -4) = 0
(21 * -2 + -1b * -2) + 3(b + -4) = 0
(-42 + 2b) + 3(b + -4) = 0

Reorder the terms:
-42 + 2b + 3(-4 + b) = 0
-42 + 2b + (-4 * 3 + b * 3) = 0
-42 + 2b + (-12 + 3b) = 0

Reorder the terms:
-42 + -12 + 2b + 3b = 0

Combine like terms: -42 + -12 = -54
-54 + 2b + 3b = 0

Combine like terms: 2b + 3b = 5b
-54 + 5b = 0

Solving
-54 + 5b = 0

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '54' to each side of the equation.
-54 + 54 + 5b = 0 + 54

Combine like terms: -54 + 54 = 0
0 + 5b = 0 + 54
5b = 0 + 54

Combine like terms: 0 + 54 = 54
5b = 54

Divide each side by '5'.
b = 10.8

Simplifying
b = 10.8

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