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Simplifying 21(2 + -1x) = 12x (2 * 21 + -1x * 21) = 12x (42 + -21x) = 12x Solving 42 + -21x = 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. 42 + -21x + -12x = 12x + -12x Combine like terms: -21x + -12x = -33x 42 + -33x = 12x + -12x Combine like terms: 12x + -12x = 0 42 + -33x = 0 Add '-42' to each side of the equation. 42 + -42 + -33x = 0 + -42 Combine like terms: 42 + -42 = 0 0 + -33x = 0 + -42 -33x = 0 + -42 Combine like terms: 0 + -42 = -42 -33x = -42 Divide each side by '-33'. x = 1.272727273 Simplifying x = 1.272727273
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