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Simplifying 132 = 6.4x + 6.9(20 + -1x) 132 = 6.4x + (20 * 6.9 + -1x * 6.9) 132 = 6.4x + (138 + -6.9x) Reorder the terms: 132 = 138 + 6.4x + -6.9x Combine like terms: 6.4x + -6.9x = -0.5x 132 = 138 + -0.5x Solving 132 = 138 + -0.5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5x' to each side of the equation. 132 + 0.5x = 138 + -0.5x + 0.5x Combine like terms: -0.5x + 0.5x = 0.0 132 + 0.5x = 138 + 0.0 132 + 0.5x = 138 Add '-132' to each side of the equation. 132 + -132 + 0.5x = 138 + -132 Combine like terms: 132 + -132 = 0 0 + 0.5x = 138 + -132 0.5x = 138 + -132 Combine like terms: 138 + -132 = 6 0.5x = 6 Divide each side by '0.5'. x = 12 Simplifying x = 12
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