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Simplifying 3 + -7x = -5x + -21 Reorder the terms: 3 + -7x = -21 + -5x Solving 3 + -7x = -21 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. 3 + -7x + 5x = -21 + -5x + 5x Combine like terms: -7x + 5x = -2x 3 + -2x = -21 + -5x + 5x Combine like terms: -5x + 5x = 0 3 + -2x = -21 + 0 3 + -2x = -21 Add '-3' to each side of the equation. 3 + -3 + -2x = -21 + -3 Combine like terms: 3 + -3 = 0 0 + -2x = -21 + -3 -2x = -21 + -3 Combine like terms: -21 + -3 = -24 -2x = -24 Divide each side by '-2'. x = 12 Simplifying x = 12
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