13a-12a=15-19

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Solution for 13a-12a=15-19 equation: 



13a-12a=15-19

We move all terms to the left:

13a-12a-(15-19)=0

We add all the numbers together, and all the variables

13a-12a-(-4)=0

We add all the numbers together, and all the variables

a+4=0

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

a=-4

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