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Simplifying 5x + (-2 + 2x) + 21 = 12 Remove parenthesis around (-2 + 2x) 5x + -2 + 2x + 21 = 12 Reorder the terms: -2 + 21 + 5x + 2x = 12 Combine like terms: -2 + 21 = 19 19 + 5x + 2x = 12 Combine like terms: 5x + 2x = 7x 19 + 7x = 12 Solving 19 + 7x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-19' to each side of the equation. 19 + -19 + 7x = 12 + -19 Combine like terms: 19 + -19 = 0 0 + 7x = 12 + -19 7x = 12 + -19 Combine like terms: 12 + -19 = -7 7x = -7 Divide each side by '7'. x = -1 Simplifying x = -1
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