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Simplifying 21 + 4x = 2(-1x + 5) + -13 Reorder the terms: 21 + 4x = 2(5 + -1x) + -13 21 + 4x = (5 * 2 + -1x * 2) + -13 21 + 4x = (10 + -2x) + -13 Reorder the terms: 21 + 4x = 10 + -13 + -2x Combine like terms: 10 + -13 = -3 21 + 4x = -3 + -2x Solving 21 + 4x = -3 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 21 + 4x + 2x = -3 + -2x + 2x Combine like terms: 4x + 2x = 6x 21 + 6x = -3 + -2x + 2x Combine like terms: -2x + 2x = 0 21 + 6x = -3 + 0 21 + 6x = -3 Add '-21' to each side of the equation. 21 + -21 + 6x = -3 + -21 Combine like terms: 21 + -21 = 0 0 + 6x = -3 + -21 6x = -3 + -21 Combine like terms: -3 + -21 = -24 6x = -24 Divide each side by '6'. x = -4 Simplifying x = -4
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