15-10a=-75

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Solution for 15-10a=-75 equation: 



15-10a=-75

We move all terms to the left:

15-10a-(-75)=0

We add all the numbers together, and all the variables

-10a+90=0

We move all terms containing a to the left, all other terms to the right

-10a=-90

a=-90/-10

a=+9

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