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Simplifying 12 + -7 = 56 + -21x Combine like terms: 12 + -7 = 5 5 = 56 + -21x Solving 5 = 56 + -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. 5 + 21x = 56 + -21x + 21x Combine like terms: -21x + 21x = 0 5 + 21x = 56 + 0 5 + 21x = 56 Add '-5' to each side of the equation. 5 + -5 + 21x = 56 + -5 Combine like terms: 5 + -5 = 0 0 + 21x = 56 + -5 21x = 56 + -5 Combine like terms: 56 + -5 = 51 21x = 51 Divide each side by '21'. x = 2.428571429 Simplifying x = 2.428571429
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