-840=-20(-6b)

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Solution for -840=-20(-6b) equation:


Simplifying
-840 = -20(-6b)

Remove parenthesis around (-6b)
-840 = -20 * -6b

Multiply -20 * -6
-840 = 120b

Solving
-840 = 120b

Solving for variable 'b'.

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

Add '-120b' to each side of the equation.
-840 + -120b = 120b + -120b

Combine like terms: 120b + -120b = 0
-840 + -120b = 0

Add '840' to each side of the equation.
-840 + 840 + -120b = 0 + 840

Combine like terms: -840 + 840 = 0
0 + -120b = 0 + 840
-120b = 0 + 840

Combine like terms: 0 + 840 = 840
-120b = 840

Divide each side by '-120'.
b = -7

Simplifying
b = -7

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