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Simplifying (-7) = 6 + -1(9 + -1b) -7 = 6 + -1(9 + -1b) -7 = 6 + (9 * -1 + -1b * -1) -7 = 6 + (-9 + 1b) Combine like terms: 6 + -9 = -3 -7 = -3 + 1b Solving -7 = -3 + 1b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1b' to each side of the equation. -7 + -1b = -3 + 1b + -1b Combine like terms: 1b + -1b = 0 -7 + -1b = -3 + 0 -7 + -1b = -3 Add '7' to each side of the equation. -7 + 7 + -1b = -3 + 7 Combine like terms: -7 + 7 = 0 0 + -1b = -3 + 7 -1b = -3 + 7 Combine like terms: -3 + 7 = 4 -1b = 4 Divide each side by '-1'. b = -4 Simplifying b = -4
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