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Simplifying 39 + -4x = 12 + -7x Solving 39 + -4x = 12 + -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. 39 + -4x + 7x = 12 + -7x + 7x Combine like terms: -4x + 7x = 3x 39 + 3x = 12 + -7x + 7x Combine like terms: -7x + 7x = 0 39 + 3x = 12 + 0 39 + 3x = 12 Add '-39' to each side of the equation. 39 + -39 + 3x = 12 + -39 Combine like terms: 39 + -39 = 0 0 + 3x = 12 + -39 3x = 12 + -39 Combine like terms: 12 + -39 = -27 3x = -27 Divide each side by '3'. x = -9 Simplifying x = -9
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