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Simplifying 9 + -7x = -4x + -21 Reorder the terms: 9 + -7x = -21 + -4x Solving 9 + -7x = -21 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 9 + -7x + 4x = -21 + -4x + 4x Combine like terms: -7x + 4x = -3x 9 + -3x = -21 + -4x + 4x Combine like terms: -4x + 4x = 0 9 + -3x = -21 + 0 9 + -3x = -21 Add '-9' to each side of the equation. 9 + -9 + -3x = -21 + -9 Combine like terms: 9 + -9 = 0 0 + -3x = -21 + -9 -3x = -21 + -9 Combine like terms: -21 + -9 = -30 -3x = -30 Divide each side by '-3'. x = 10 Simplifying x = 10
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