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Simplifying 21(2 + -1x) + 12x = 4 (2 * 21 + -1x * 21) + 12x = 4 (42 + -21x) + 12x = 4 Combine like terms: -21x + 12x = -9x 42 + -9x = 4 Solving 42 + -9x = 4 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 = 4 + -42 Combine like terms: 42 + -42 = 0 0 + -9x = 4 + -42 -9x = 4 + -42 Combine like terms: 4 + -42 = -38 -9x = -38 Divide each side by '-9'. x = 4.222222222 Simplifying x = 4.222222222
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