10a+10a-2=-42

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Solution for 10a+10a-2=-42 equation: 



10a+10a-2=-42

We move all terms to the left:

10a+10a-2-(-42)=0

We add all the numbers together, and all the variables

20a+40=0

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

20a=-40

a=-40/20

a=-2

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