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Simplifying 20x + -21x + 7 = 12 + -15 Reorder the terms: 7 + 20x + -21x = 12 + -15 Combine like terms: 20x + -21x = -1x 7 + -1x = 12 + -15 Combine like terms: 12 + -15 = -3 7 + -1x = -3 Solving 7 + -1x = -3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1x = -3 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = -3 + -7 -1x = -3 + -7 Combine like terms: -3 + -7 = -10 -1x = -10 Divide each side by '-1'. x = 10 Simplifying x = 10
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