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Simplifying 129 + -7X = 20X + 18 Reorder the terms: 129 + -7X = 18 + 20X Solving 129 + -7X = 18 + 20X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-20X' to each side of the equation. 129 + -7X + -20X = 18 + 20X + -20X Combine like terms: -7X + -20X = -27X 129 + -27X = 18 + 20X + -20X Combine like terms: 20X + -20X = 0 129 + -27X = 18 + 0 129 + -27X = 18 Add '-129' to each side of the equation. 129 + -129 + -27X = 18 + -129 Combine like terms: 129 + -129 = 0 0 + -27X = 18 + -129 -27X = 18 + -129 Combine like terms: 18 + -129 = -111 -27X = -111 Divide each side by '-27'. X = 4.111111111 Simplifying X = 4.111111111
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