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Simplifying 9x + 7 + -2(x + -7) = -21 Reorder the terms: 9x + 7 + -2(-7 + x) = -21 9x + 7 + (-7 * -2 + x * -2) = -21 9x + 7 + (14 + -2x) = -21 Reorder the terms: 7 + 14 + 9x + -2x = -21 Combine like terms: 7 + 14 = 21 21 + 9x + -2x = -21 Combine like terms: 9x + -2x = 7x 21 + 7x = -21 Solving 21 + 7x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 7x = -21 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = -21 + -21 7x = -21 + -21 Combine like terms: -21 + -21 = -42 7x = -42 Divide each side by '7'. x = -6 Simplifying x = -6
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