(21b-2)-5(4b+1)=-7

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Solution for (21b-2)-5(4b+1)=-7 equation:


Simplifying
(21b + -2) + -5(4b + 1) = -7

Reorder the terms:
(-2 + 21b) + -5(4b + 1) = -7

Remove parenthesis around (-2 + 21b)
-2 + 21b + -5(4b + 1) = -7

Reorder the terms:
-2 + 21b + -5(1 + 4b) = -7
-2 + 21b + (1 * -5 + 4b * -5) = -7
-2 + 21b + (-5 + -20b) = -7

Reorder the terms:
-2 + -5 + 21b + -20b = -7

Combine like terms: -2 + -5 = -7
-7 + 21b + -20b = -7

Combine like terms: 21b + -20b = 1b
-7 + 1b = -7

Add '7' to each side of the equation.
-7 + 7 + 1b = -7 + 7

Combine like terms: -7 + 7 = 0
0 + 1b = -7 + 7
1b = -7 + 7

Combine like terms: -7 + 7 = 0
1b = 0

Solving
1b = 0

Solving for variable 'b'.

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

Divide each side by '1'.
b = 0

Simplifying
b = 0

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