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Simplifying 2x + 3(x + -1) = 21 + -1x Reorder the terms: 2x + 3(-1 + x) = 21 + -1x 2x + (-1 * 3 + x * 3) = 21 + -1x 2x + (-3 + 3x) = 21 + -1x Reorder the terms: -3 + 2x + 3x = 21 + -1x Combine like terms: 2x + 3x = 5x -3 + 5x = 21 + -1x Solving -3 + 5x = 21 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. -3 + 5x + x = 21 + -1x + x Combine like terms: 5x + x = 6x -3 + 6x = 21 + -1x + x Combine like terms: -1x + x = 0 -3 + 6x = 21 + 0 -3 + 6x = 21 Add '3' to each side of the equation. -3 + 3 + 6x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 6x = 21 + 3 6x = 21 + 3 Combine like terms: 21 + 3 = 24 6x = 24 Divide each side by '6'. x = 4 Simplifying x = 4
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