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Simplifying -3x + -21 = 4x + 21 Reorder the terms: -21 + -3x = 4x + 21 Reorder the terms: -21 + -3x = 21 + 4x Solving -21 + -3x = 21 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -21 + -3x + -4x = 21 + 4x + -4x Combine like terms: -3x + -4x = -7x -21 + -7x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + -7x = 21 + 0 -21 + -7x = 21 Add '21' to each side of the equation. -21 + 21 + -7x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + -7x = 21 + 21 -7x = 21 + 21 Combine like terms: 21 + 21 = 42 -7x = 42 Divide each side by '-7'. x = -6 Simplifying x = -6
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