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Simplifying 7x + 21 + 2x + -6 = 2x Reorder the terms: 21 + -6 + 7x + 2x = 2x Combine like terms: 21 + -6 = 15 15 + 7x + 2x = 2x Combine like terms: 7x + 2x = 9x 15 + 9x = 2x Solving 15 + 9x = 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. 15 + 9x + -2x = 2x + -2x Combine like terms: 9x + -2x = 7x 15 + 7x = 2x + -2x Combine like terms: 2x + -2x = 0 15 + 7x = 0 Add '-15' to each side of the equation. 15 + -15 + 7x = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 7x = 0 + -15 7x = 0 + -15 Combine like terms: 0 + -15 = -15 7x = -15 Divide each side by '7'. x = -2.142857143 Simplifying x = -2.142857143
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