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Simplifying 6 + -1(3 + -1x) = 21 + -3.5x 6 + (3 * -1 + -1x * -1) = 21 + -3.5x 6 + (-3 + 1x) = 21 + -3.5x Combine like terms: 6 + -3 = 3 3 + 1x = 21 + -3.5x Solving 3 + 1x = 21 + -3.5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5x' to each side of the equation. 3 + 1x + 3.5x = 21 + -3.5x + 3.5x Combine like terms: 1x + 3.5x = 4.5x 3 + 4.5x = 21 + -3.5x + 3.5x Combine like terms: -3.5x + 3.5x = 0.0 3 + 4.5x = 21 + 0.0 3 + 4.5x = 21 Add '-3' to each side of the equation. 3 + -3 + 4.5x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 4.5x = 21 + -3 4.5x = 21 + -3 Combine like terms: 21 + -3 = 18 4.5x = 18 Divide each side by '4.5'. x = 4 Simplifying x = 4
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