9=-7/10a-12

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Solution for 9=-7/10a-12 equation: 



9=-7/10a-12

We move all terms to the left:

9-(-7/10a-12)=0



Domain of the equation: 10a-12)!=0

a∈R



We get rid of parentheses

7/10a+12+9=0

We multiply all the terms by the denominator


12*10a+9*10a+7=0

Wy multiply elements

120a+90a+7=0

We add all the numbers together, and all the variables

210a+7=0

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

210a=-7

a=-7/210

a=-1/30

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