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Simplifying 21 + -1(x + 6) = 9x + -5 Reorder the terms: 21 + -1(6 + x) = 9x + -5 21 + (6 * -1 + x * -1) = 9x + -5 21 + (-6 + -1x) = 9x + -5 Combine like terms: 21 + -6 = 15 15 + -1x = 9x + -5 Reorder the terms: 15 + -1x = -5 + 9x Solving 15 + -1x = -5 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 15 + -1x + -9x = -5 + 9x + -9x Combine like terms: -1x + -9x = -10x 15 + -10x = -5 + 9x + -9x Combine like terms: 9x + -9x = 0 15 + -10x = -5 + 0 15 + -10x = -5 Add '-15' to each side of the equation. 15 + -15 + -10x = -5 + -15 Combine like terms: 15 + -15 = 0 0 + -10x = -5 + -15 -10x = -5 + -15 Combine like terms: -5 + -15 = -20 -10x = -20 Divide each side by '-10'. x = 2 Simplifying x = 2
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