15 ( 2 a + ( 30 - 1 ) \frac { - 2 a } { 29 }
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15\left(2a+29\times \frac{-2a}{29}\right)
Subtract 1 from 30 to get 29.
15\left(2a-2a\right)
Cancel out 29 and 29.
15\times 0
Combine 2a and -2a to get 0.
0
Multiply 15 and 0 to get 0.
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