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Simplifying 3x + 42 = 4x + 45 Reorder the terms: 42 + 3x = 4x + 45 Reorder the terms: 42 + 3x = 45 + 4x Solving 42 + 3x = 45 + 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. 42 + 3x + -4x = 45 + 4x + -4x Combine like terms: 3x + -4x = -1x 42 + -1x = 45 + 4x + -4x Combine like terms: 4x + -4x = 0 42 + -1x = 45 + 0 42 + -1x = 45 Add '-42' to each side of the equation. 42 + -42 + -1x = 45 + -42 Combine like terms: 42 + -42 = 0 0 + -1x = 45 + -42 -1x = 45 + -42 Combine like terms: 45 + -42 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3
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