-140=-10(-2b)

Solution for -140=-10(-2b) equation:

Simplifying
-140 = -10(-2b)

Remove parenthesis around (-2b)
-140 = -10 * -2b

Multiply -10 * -2
-140 = 20b

Solving
-140 = 20b

Solving for variable 'b'.

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

Add '-20b' to each side of the equation.
-140 + -20b = 20b + -20b

Combine like terms: 20b + -20b = 0
-140 + -20b = 0

Add '140' to each side of the equation.
-140 + 140 + -20b = 0 + 140

Combine like terms: -140 + 140 = 0
0 + -20b = 0 + 140
-20b = 0 + 140

Combine like terms: 0 + 140 = 140
-20b = 140

Divide each side by '-20'.
b = -7

Simplifying
b = -7