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Simplifying 12 + -7x = 66 + -21x Solving 12 + -7x = 66 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 12 + -7x + 21x = 66 + -21x + 21x Combine like terms: -7x + 21x = 14x 12 + 14x = 66 + -21x + 21x Combine like terms: -21x + 21x = 0 12 + 14x = 66 + 0 12 + 14x = 66 Add '-12' to each side of the equation. 12 + -12 + 14x = 66 + -12 Combine like terms: 12 + -12 = 0 0 + 14x = 66 + -12 14x = 66 + -12 Combine like terms: 66 + -12 = 54 14x = 54 Divide each side by '14'. x = 3.857142857 Simplifying x = 3.857142857
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