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Simplifying -90 = -10 + -1(-3b) Remove parenthesis around (-3b) -90 = -10 + -1 * -3b Multiply -1 * -3 -90 = -10 + 3b Solving -90 = -10 + 3b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3b' to each side of the equation. -90 + -3b = -10 + 3b + -3b Combine like terms: 3b + -3b = 0 -90 + -3b = -10 + 0 -90 + -3b = -10 Add '90' to each side of the equation. -90 + 90 + -3b = -10 + 90 Combine like terms: -90 + 90 = 0 0 + -3b = -10 + 90 -3b = -10 + 90 Combine like terms: -10 + 90 = 80 -3b = 80 Divide each side by '-3'. b = -26.66666667 Simplifying b = -26.66666667
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