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Simplifying 55 + -7x = 2x + 21 Reorder the terms: 55 + -7x = 21 + 2x Solving 55 + -7x = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 55 + -7x + -2x = 21 + 2x + -2x Combine like terms: -7x + -2x = -9x 55 + -9x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 55 + -9x = 21 + 0 55 + -9x = 21 Add '-55' to each side of the equation. 55 + -55 + -9x = 21 + -55 Combine like terms: 55 + -55 = 0 0 + -9x = 21 + -55 -9x = 21 + -55 Combine like terms: 21 + -55 = -34 -9x = -34 Divide each side by '-9'. x = 3.777777778 Simplifying x = 3.777777778
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