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Simplifying 42 + x = 3x Solving 42 + x = 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 + x + -3x = 3x + -3x Combine like terms: x + -3x = -2x 42 + -2x = 3x + -3x Combine like terms: 3x + -3x = 0 42 + -2x = 0 Add '-42' to each side of the equation. 42 + -42 + -2x = 0 + -42 Combine like terms: 42 + -42 = 0 0 + -2x = 0 + -42 -2x = 0 + -42 Combine like terms: 0 + -42 = -42 -2x = -42 Divide each side by '-2'. x = 21 Simplifying x = 21
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