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Simplifying 21(2 + -1x) + 12x = 54 (2 * 21 + -1x * 21) + 12x = 54 (42 + -21x) + 12x = 54 Combine like terms: -21x + 12x = -9x 42 + -9x = 54 Solving 42 + -9x = 54 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + -9x = 54 + -42 Combine like terms: 42 + -42 = 0 0 + -9x = 54 + -42 -9x = 54 + -42 Combine like terms: 54 + -42 = 12 -9x = 12 Divide each side by '-9'. x = -1.333333333 Simplifying x = -1.333333333
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