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Simplifying -21 + -2x = 7 + -9x Solving -21 + -2x = 7 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -21 + -2x + 9x = 7 + -9x + 9x Combine like terms: -2x + 9x = 7x -21 + 7x = 7 + -9x + 9x Combine like terms: -9x + 9x = 0 -21 + 7x = 7 + 0 -21 + 7x = 7 Add '21' to each side of the equation. -21 + 21 + 7x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 7x = 7 + 21 7x = 7 + 21 Combine like terms: 7 + 21 = 28 7x = 28 Divide each side by '7'. x = 4 Simplifying x = 4
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