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Simplifying x + -78 = 3x + -66 Reorder the terms: -78 + x = 3x + -66 Reorder the terms: -78 + x = -66 + 3x Solving -78 + x = -66 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -78 + x + -3x = -66 + 3x + -3x Combine like terms: x + -3x = -2x -78 + -2x = -66 + 3x + -3x Combine like terms: 3x + -3x = 0 -78 + -2x = -66 + 0 -78 + -2x = -66 Add '78' to each side of the equation. -78 + 78 + -2x = -66 + 78 Combine like terms: -78 + 78 = 0 0 + -2x = -66 + 78 -2x = -66 + 78 Combine like terms: -66 + 78 = 12 -2x = 12 Divide each side by '-2'. x = -6 Simplifying x = -6
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