Solve for x
x = \frac{24}{7} = 3\frac{3}{7} \approx 3.428571429
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45-21=7x
Multiply both sides of the equation by 63, the least common multiple of 7,3,9.
24=7x
Subtract 21 from 45 to get 24.
7x=24
Swap sides so that all variable terms are on the left hand side.
x=\frac{24}{7}
Divide both sides by 7.
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