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Simplifying -720 = -30(-3b) Remove parenthesis around (-3b) -720 = -30 * -3b Multiply -30 * -3 -720 = 90b Solving -720 = 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. -720 + -90b = 90b + -90b Combine like terms: 90b + -90b = 0 -720 + -90b = 0 Add '720' to each side of the equation. -720 + 720 + -90b = 0 + 720 Combine like terms: -720 + 720 = 0 0 + -90b = 0 + 720 -90b = 0 + 720 Combine like terms: 0 + 720 = 720 -90b = 720 Divide each side by '-90'. b = -8 Simplifying b = -8
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