Solve for d
d=72
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9\times 32=4d
Multiply both sides of the equation by 180, the least common multiple of 20,45.
288=4d
Multiply 9 and 32 to get 288.
4d=288
Swap sides so that all variable terms are on the left hand side.
d=\frac{288}{4}
Divide both sides by 4.
d=72
Divide 288 by 4 to get 72.
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