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Simplifying -63 = 2x + -1(21 + -1x) -63 = 2x + (21 * -1 + -1x * -1) -63 = 2x + (-21 + 1x) Reorder the terms: -63 = -21 + 2x + 1x Combine like terms: 2x + 1x = 3x -63 = -21 + 3x Solving -63 = -21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -63 + -3x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 -63 + -3x = -21 + 0 -63 + -3x = -21 Add '63' to each side of the equation. -63 + 63 + -3x = -21 + 63 Combine like terms: -63 + 63 = 0 0 + -3x = -21 + 63 -3x = -21 + 63 Combine like terms: -21 + 63 = 42 -3x = 42 Divide each side by '-3'. x = -14 Simplifying x = -14
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