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Simplifying 4x + -30 = 3x + -21 Reorder the terms: -30 + 4x = 3x + -21 Reorder the terms: -30 + 4x = -21 + 3x Solving -30 + 4x = -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. -30 + 4x + -3x = -21 + 3x + -3x Combine like terms: 4x + -3x = 1x -30 + 1x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 -30 + 1x = -21 + 0 -30 + 1x = -21 Add '30' to each side of the equation. -30 + 30 + 1x = -21 + 30 Combine like terms: -30 + 30 = 0 0 + 1x = -21 + 30 1x = -21 + 30 Combine like terms: -21 + 30 = 9 1x = 9 Divide each side by '1'. x = 9 Simplifying x = 9
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