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Simplifying -39 + -7x = 21 + -4x Solving -39 + -7x = 21 + -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. -39 + -7x + 4x = 21 + -4x + 4x Combine like terms: -7x + 4x = -3x -39 + -3x = 21 + -4x + 4x Combine like terms: -4x + 4x = 0 -39 + -3x = 21 + 0 -39 + -3x = 21 Add '39' to each side of the equation. -39 + 39 + -3x = 21 + 39 Combine like terms: -39 + 39 = 0 0 + -3x = 21 + 39 -3x = 21 + 39 Combine like terms: 21 + 39 = 60 -3x = 60 Divide each side by '-3'. x = -20 Simplifying x = -20
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