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Simplifying -21 + -4x = 6 + -7x Solving -21 + -4x = 6 + -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 = 6 + -7x + 7x Combine like terms: -4x + 7x = 3x -21 + 3x = 6 + -7x + 7x Combine like terms: -7x + 7x = 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 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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