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10x-37y+12a
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10x-37y+12a
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7x+21a-35y-\left(2y-3x+9a\right)
Use the distributive property to multiply 7 by x+3a-5y.
7x+21a-35y-2y-\left(-3x\right)-9a
To find the opposite of 2y-3x+9a, find the opposite of each term.
7x+21a-35y-2y+3x-9a
The opposite of -3x is 3x.
7x+21a-37y+3x-9a
Combine -35y and -2y to get -37y.
10x+21a-37y-9a
Combine 7x and 3x to get 10x.
10x+12a-37y
Combine 21a and -9a to get 12a.
7x+21a-35y-\left(2y-3x+9a\right)
Use the distributive property to multiply 7 by x+3a-5y.
7x+21a-35y-2y-\left(-3x\right)-9a
To find the opposite of 2y-3x+9a, find the opposite of each term.
7x+21a-35y-2y+3x-9a
The opposite of -3x is 3x.
7x+21a-37y+3x-9a
Combine -35y and -2y to get -37y.
10x+21a-37y-9a
Combine 7x and 3x to get 10x.
10x+12a-37y
Combine 21a and -9a to get 12a.
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