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Simplifying 66 + -220d = 90d + -285 Reorder the terms: 66 + -220d = -285 + 90d Solving 66 + -220d = -285 + 90d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-90d' to each side of the equation. 66 + -220d + -90d = -285 + 90d + -90d Combine like terms: -220d + -90d = -310d 66 + -310d = -285 + 90d + -90d Combine like terms: 90d + -90d = 0 66 + -310d = -285 + 0 66 + -310d = -285 Add '-66' to each side of the equation. 66 + -66 + -310d = -285 + -66 Combine like terms: 66 + -66 = 0 0 + -310d = -285 + -66 -310d = -285 + -66 Combine like terms: -285 + -66 = -351 -310d = -351 Divide each side by '-310'. d = 1.132258065 Simplifying d = 1.132258065
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