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72\left(\frac{x}{24}+\frac{1}{9}y\right)-72\left(\frac{x}{24}+\frac{y}{36}\right)=72-72
Multiply both sides of the equation by 72, the least common multiple of 24,9,36.
72\times \frac{x}{24}+8y-72\left(\frac{x}{24}+\frac{y}{36}\right)=72-72
Use the distributive property to multiply 72 by \frac{x}{24}+\frac{1}{9}y.
3x+8y-72\left(\frac{x}{24}+\frac{y}{36}\right)=72-72
Cancel out 24, the greatest common factor in 72 and 24.
3x+8y-72\left(\frac{3x}{72}+\frac{2y}{72}\right)=72-72
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 24 and 36 is 72. Multiply \frac{x}{24} times \frac{3}{3}. Multiply \frac{y}{36} times \frac{2}{2}.
3x+8y-72\times \frac{3x+2y}{72}=72-72
Since \frac{3x}{72} and \frac{2y}{72} have the same denominator, add them by adding their numerators.
3x+8y-\frac{72\left(3x+2y\right)}{72}=72-72
Express 72\times \frac{3x+2y}{72} as a single fraction.
3x+8y-\left(3x+2y\right)=72-72
Cancel out 72 and 72.
3x+8y-3x-2y=72-72
To find the opposite of 3x+2y, find the opposite of each term.
8y-2y=72-72
Combine 3x and -3x to get 0.
6y=72-72
Combine 8y and -2y to get 6y.
6y=0
Subtract 72 from 72 to get 0.
y=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 6 is not equal to 0, y must be equal to 0.