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Simplifying 42 = 3x + 21 Reorder the terms: 42 = 21 + 3x Solving 42 = 21 + 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. 42 + -3x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 42 + -3x = 21 + 0 42 + -3x = 21 Add '-42' to each side of the equation. 42 + -42 + -3x = 21 + -42 Combine like terms: 42 + -42 = 0 0 + -3x = 21 + -42 -3x = 21 + -42 Combine like terms: 21 + -42 = -21 -3x = -21 Divide each side by '-3'. x = 7 Simplifying x = 7
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