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Simplifying -630 = -30(-3b) Remove parenthesis around (-3b) -630 = -30 * -3b Multiply -30 * -3 -630 = 90b Solving -630 = 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. -630 + -90b = 90b + -90b Combine like terms: 90b + -90b = 0 -630 + -90b = 0 Add '630' to each side of the equation. -630 + 630 + -90b = 0 + 630 Combine like terms: -630 + 630 = 0 0 + -90b = 0 + 630 -90b = 0 + 630 Combine like terms: 0 + 630 = 630 -90b = 630 Divide each side by '-90'. b = -7 Simplifying b = -7
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