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Solve the following equation
d+d+45=85
Solve for d
d + d + 45 = 85
(1 + 1)d = 2d
2d + 45 = + 85
Group our constants 45 and 85. subtract 45 from both sides
2d + 45 - 45 = 85 - 45
2d = 40
d = 20
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