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Simplifying 55 + -6x = 12x + 21 Reorder the terms: 55 + -6x = 21 + 12x Solving 55 + -6x = 21 + 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. 55 + -6x + -12x = 21 + 12x + -12x Combine like terms: -6x + -12x = -18x 55 + -18x = 21 + 12x + -12x Combine like terms: 12x + -12x = 0 55 + -18x = 21 + 0 55 + -18x = 21 Add '-55' to each side of the equation. 55 + -55 + -18x = 21 + -55 Combine like terms: 55 + -55 = 0 0 + -18x = 21 + -55 -18x = 21 + -55 Combine like terms: 21 + -55 = -34 -18x = -34 Divide each side by '-18'. x = 1.888888889 Simplifying x = 1.888888889
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