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Simplifying 21 = d + 19 Reorder the terms: 21 = 19 + d Solving 21 = 19 + d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1d' to each side of the equation. 21 + -1d = 19 + d + -1d Combine like terms: d + -1d = 0 21 + -1d = 19 + 0 21 + -1d = 19 Add '-21' to each side of the equation. 21 + -21 + -1d = 19 + -21 Combine like terms: 21 + -21 = 0 0 + -1d = 19 + -21 -1d = 19 + -21 Combine like terms: 19 + -21 = -2 -1d = -2 Divide each side by '-1'. d = 2 Simplifying d = 2
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