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Simplifying 3 + 4x = 12x + -42 Reorder the terms: 3 + 4x = -42 + 12x Solving 3 + 4x = -42 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 3 + 4x + -12x = -42 + 12x + -12x Combine like terms: 4x + -12x = -8x 3 + -8x = -42 + 12x + -12x Combine like terms: 12x + -12x = 0 3 + -8x = -42 + 0 3 + -8x = -42 Add '-3' to each side of the equation. 3 + -3 + -8x = -42 + -3 Combine like terms: 3 + -3 = 0 0 + -8x = -42 + -3 -8x = -42 + -3 Combine like terms: -42 + -3 = -45 -8x = -45 Divide each side by '-8'. x = 5.625 Simplifying x = 5.625
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