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Simplifying 3x + -21 = -4x + 7 Reorder the terms: -21 + 3x = -4x + 7 Reorder the terms: -21 + 3x = 7 + -4x Solving -21 + 3x = 7 + -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 = 7 + -4x + 4x Combine like terms: 3x + 4x = 7x -21 + 7x = 7 + -4x + 4x Combine like terms: -4x + 4x = 0 -21 + 7x = 7 + 0 -21 + 7x = 7 Add '21' to each side of the equation. -21 + 21 + 7x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 7x = 7 + 21 7x = 7 + 21 Combine like terms: 7 + 21 = 28 7x = 28 Divide each side by '7'. x = 4 Simplifying x = 4
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