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Simplifying 42 = 3(7 + d) 42 = (7 * 3 + d * 3) 42 = (21 + 3d) Solving 42 = 21 + 3d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-3d' to each side of the equation. 42 + -3d = 21 + 3d + -3d Combine like terms: 3d + -3d = 0 42 + -3d = 21 + 0 42 + -3d = 21 Add '-42' to each side of the equation. 42 + -42 + -3d = 21 + -42 Combine like terms: 42 + -42 = 0 0 + -3d = 21 + -42 -3d = 21 + -42 Combine like terms: 21 + -42 = -21 -3d = -21 Divide each side by '-3'. d = 7 Simplifying d = 7
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