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Simplifying 7 = 9(B + -20) Reorder the terms: 7 = 9(-20 + B) 7 = (-20 * 9 + B * 9) 7 = (-180 + 9B) Solving 7 = -180 + 9B Solving for variable 'B'. Move all terms containing B to the left, all other terms to the right. Add '-9B' to each side of the equation. 7 + -9B = -180 + 9B + -9B Combine like terms: 9B + -9B = 0 7 + -9B = -180 + 0 7 + -9B = -180 Add '-7' to each side of the equation. 7 + -7 + -9B = -180 + -7 Combine like terms: 7 + -7 = 0 0 + -9B = -180 + -7 -9B = -180 + -7 Combine like terms: -180 + -7 = -187 -9B = -187 Divide each side by '-9'. B = 20.77777778 Simplifying B = 20.77777778
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