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Simplifying -810 = -30(-3b) Remove parenthesis around (-3b) -810 = -30 * -3b Multiply -30 * -3 -810 = 90b Solving -810 = 90b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-90b' to each side of the equation. -810 + -90b = 90b + -90b Combine like terms: 90b + -90b = 0 -810 + -90b = 0 Add '810' to each side of the equation. -810 + 810 + -90b = 0 + 810 Combine like terms: -810 + 810 = 0 0 + -90b = 0 + 810 -90b = 0 + 810 Combine like terms: 0 + 810 = 810 -90b = 810 Divide each side by '-90'. b = -9 Simplifying b = -9
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