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Simplifying 2x + 4 = 21 + -7x Reorder the terms: 4 + 2x = 21 + -7x Solving 4 + 2x = 21 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 4 + 2x + 7x = 21 + -7x + 7x Combine like terms: 2x + 7x = 9x 4 + 9x = 21 + -7x + 7x Combine like terms: -7x + 7x = 0 4 + 9x = 21 + 0 4 + 9x = 21 Add '-4' to each side of the equation. 4 + -4 + 9x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 9x = 21 + -4 9x = 21 + -4 Combine like terms: 21 + -4 = 17 9x = 17 Divide each side by '9'. x = 1.888888889 Simplifying x = 1.888888889
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