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Simplifying 4x + -21 = 7x + -9 Reorder the terms: -21 + 4x = 7x + -9 Reorder the terms: -21 + 4x = -9 + 7x Solving -21 + 4x = -9 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -21 + 4x + -7x = -9 + 7x + -7x Combine like terms: 4x + -7x = -3x -21 + -3x = -9 + 7x + -7x Combine like terms: 7x + -7x = 0 -21 + -3x = -9 + 0 -21 + -3x = -9 Add '21' to each side of the equation. -21 + 21 + -3x = -9 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = -9 + 21 -3x = -9 + 21 Combine like terms: -9 + 21 = 12 -3x = 12 Divide each side by '-3'. x = -4 Simplifying x = -4
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