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Simplifying 7x + -21 = 4x + -6 Reorder the terms: -21 + 7x = 4x + -6 Reorder the terms: -21 + 7x = -6 + 4x Solving -21 + 7x = -6 + 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 + 7x + -4x = -6 + 4x + -4x Combine like terms: 7x + -4x = 3x -21 + 3x = -6 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + 3x = -6 + 0 -21 + 3x = -6 Add '21' to each side of the equation. -21 + 21 + 3x = -6 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = -6 + 21 3x = -6 + 21 Combine like terms: -6 + 21 = 15 3x = 15 Divide each side by '3'. x = 5 Simplifying x = 5
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