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Simplifying -5x + 10 + 4x + -7 + 12 = 21 Reorder the terms: 10 + -7 + 12 + -5x + 4x = 21 Combine like terms: 10 + -7 = 3 3 + 12 + -5x + 4x = 21 Combine like terms: 3 + 12 = 15 15 + -5x + 4x = 21 Combine like terms: -5x + 4x = -1x 15 + -1x = 21 Solving 15 + -1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -1x = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -1x = 21 + -15 -1x = 21 + -15 Combine like terms: 21 + -15 = 6 -1x = 6 Divide each side by '-1'. x = -6 Simplifying x = -6
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