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Simplifying 4x + 21 = 13x + -15 Reorder the terms: 21 + 4x = 13x + -15 Reorder the terms: 21 + 4x = -15 + 13x Solving 21 + 4x = -15 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. 21 + 4x + -13x = -15 + 13x + -13x Combine like terms: 4x + -13x = -9x 21 + -9x = -15 + 13x + -13x Combine like terms: 13x + -13x = 0 21 + -9x = -15 + 0 21 + -9x = -15 Add '-21' to each side of the equation. 21 + -21 + -9x = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = -15 + -21 -9x = -15 + -21 Combine like terms: -15 + -21 = -36 -9x = -36 Divide each side by '-9'. x = 4 Simplifying x = 4
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