78=7a-10a

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Solution for 78=7a-10a equation: 



78=7a-10a

We move all terms to the left:

78-(7a-10a)=0

We add all the numbers together, and all the variables

-(-3a)+78=0

We get rid of parentheses

3a+78=0

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

3a=-78

a=-78/3

a=-26

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